cleanup: Remove obsolete code related to SS extension

- Remove external install dialogs and fix related screensharing error handling.
- Remove obsolete options from config.js and from configWhitelist.js

conference.js

-/* global $, APP, JitsiMeetJS, config, interfaceConfig */
+/* global APP, JitsiMeetJS, config, interfaceConfig */
 
 import EventEmitter from 'events';
 import Logger from 'jitsi-meet-logger';
      * @private
      */
     _createDesktopTrack(options = {}) {
-        let externalInstallation = false;
-        let DSExternalInstallationInProgress = false;
         const didHaveVideo = !this.isLocalVideoMuted();
 
         const getDesktopStreamPromise = options.desktopStream
                 desktopSharingSourceDevice: options.desktopSharingSources
                     ? null : config._desktopSharingSourceDevice,
                 desktopSharingSources: options.desktopSharingSources,
-                devices: [ 'desktop' ],
-                desktopSharingExtensionExternalInstallation: {
-                    interval: 500,
-                    checkAgain: () => DSExternalInstallationInProgress,
-                    listener: (status, url) => {
-                        switch (status) {
-                        case 'waitingForExtension': {
-                            DSExternalInstallationInProgress = true;
-                            externalInstallation = true;
-                            const listener = () => {
-                                // Wait a little bit more just to be sure that
-                                // we won't miss the extension installation
-                                setTimeout(() => {
-                                    DSExternalInstallationInProgress = false;
-                                },
-                                500);
-                                APP.UI.removeListener(
-                                    UIEvents.EXTERNAL_INSTALLATION_CANCELED,
-                                    listener);
-                            };
-
-                            APP.UI.addListener(
-                                UIEvents.EXTERNAL_INSTALLATION_CANCELED,
-                                listener);
-                            APP.UI.showExtensionExternalInstallationDialog(url);
-                            break;
-                        }
-                        case 'extensionFound':
-                            // Close the dialog.
-                            externalInstallation && $.prompt.close();
-                            break;
-                        default:
-
-                            // Unknown status
-                        }
-                    }
-                }
+                devices: [ 'desktop' ]
             });
 
         return getDesktopStreamPromise.then(desktopStreams => {
                 );
             }
 
-            // close external installation dialog on success.
-            externalInstallation && $.prompt.close();
-
             return desktopStreams;
         }, error => {
-            DSExternalInstallationInProgress = false;
-
-            // close external installation dialog on success.
-            externalInstallation && $.prompt.close();
             throw error;
         });
     },
     /**
      * Handles {@link JitsiTrackError} returned by the lib-jitsi-meet when
      * trying to create screensharing track. It will either do nothing if
-     * the dialog was canceled on user's request or display inline installation
-     * dialog and ask the user to install the extension, once the extension is
-     * installed it will switch the conference to screensharing. The last option
-     * is that an unrecoverable error dialog will be displayed.
+     * the dialog was canceled on user's request or display an error if
+     * screensharing couldn't be started.
      * @param {JitsiTrackError} error - The error returned by
      * {@link _createDesktopTrack} Promise.
      * @private
      */
     _handleScreenSharingError(error) {
-        if (error.name === JitsiTrackErrors.CHROME_EXTENSION_USER_CANCELED) {
+        if (error.name === JitsiTrackErrors.SCREENSHARING_USER_CANCELED) {
             return;
         }
 
         logger.error('failed to share local desktop', error);
 
-        if (error.name
-                === JitsiTrackErrors.CHROME_EXTENSION_USER_GESTURE_REQUIRED) {
-            // If start with screen sharing the extension will fail to install
-            // (if not found), because the request has been triggered by the
-            // script. Show a dialog which asks user to click "install" and try
-            // again switching to the screen sharing.
-            APP.UI.showExtensionInlineInstallationDialog(
-                () => {
-                    // eslint-disable-next-line no-empty-function
-                    this.toggleScreenSharing().catch(() => {});
-                }
-            );
-
-            return;
-        }
-
         // Handling:
-        // JitsiTrackErrors.PERMISSION_DENIED
-        // JitsiTrackErrors.CHROME_EXTENSION_INSTALLATION_ERROR
         // JitsiTrackErrors.CONSTRAINT_FAILED
-        // JitsiTrackErrors.GENERAL
+        // JitsiTrackErrors.PERMISSION_DENIED
+        // JitsiTrackErrors.SCREENSHARING_GENERIC_ERROR
         // and any other
         let descriptionKey;
         let titleKey;
 
         if (error.name === JitsiTrackErrors.PERMISSION_DENIED) {
-
-            // in FF the only option for user is to deny access temporary or
-            // permanently and we only receive permission_denied
-            // we always show some info cause in case of permanently, no info
-            // shown will be bad experience
-            //
-            // TODO: detect interval between requesting permissions and received
-            // error, this way we can detect user interaction which will have
-            // longer delay
-            if (JitsiMeetJS.util.browser.isFirefox()) {
-                descriptionKey
-                    = 'dialog.screenSharingFirefoxPermissionDeniedError';
-                titleKey = 'dialog.screenSharingFirefoxPermissionDeniedTitle';
-            } else {
-                descriptionKey = 'dialog.screenSharingPermissionDeniedError';
-                titleKey = 'dialog.screenSharingFailedToInstallTitle';
-            }
+            descriptionKey = 'dialog.screenSharingPermissionDeniedError';
+            titleKey = 'dialog.screenSharingFailedTitle';
         } else if (error.name === JitsiTrackErrors.CONSTRAINT_FAILED) {
             descriptionKey = 'dialog.cameraConstraintFailedError';
             titleKey = 'deviceError.cameraError';
-        } else {
-            descriptionKey = 'dialog.screenSharingFailedToInstall';
-            titleKey = 'dialog.screenSharingFailedToInstallTitle';
+        } else if (error.name === JitsiTrackErrors.SCREENSHARING_GENERIC_ERROR) {
+            descriptionKey = 'dialog.screenSharingFailed';
+            titleKey = 'dialog.screenSharingFailedTitle';
         }
 
         APP.UI.messageHandler.showError({

config.js

 
     // Desktop sharing
 
-    // The ID of the jidesha extension for Chrome.
-    desktopSharingChromeExtId: null,
-
-    // Whether desktop sharing should be disabled on Chrome.
-    // desktopSharingChromeDisabled: false,
-
-    // The media sources to use when using screen sharing with the Chrome
-    // extension.
-    desktopSharingChromeSources: [ 'screen', 'window', 'tab' ],
-
-    // Required version of Chrome extension
-    desktopSharingChromeMinExtVersion: '0.1',
-
-    // Whether desktop sharing should be disabled on Firefox.
-    // desktopSharingFirefoxDisabled: false,
-
     // Optional desktop sharing frame rate options. Default value: min:5, max:5.
     // desktopSharingFrameRate: {
     //     min: 5,

lang/main.json

         "e2eeWarning": "WARNING: Not all participants in this meeting seem to have support for End-to-End encryption. If you enable it they won't be able to see nor hear you.",
         "enterDisplayName": "Please enter your name here",
         "error": "Error",
-        "externalInstallationMsg": "You need to install our desktop sharing extension.",
-        "externalInstallationTitle": "Extension required",
-        "goToStore": "Go to the webstore",
         "gracefulShutdown": "Our service is currently down for maintenance. Please try again later.",
         "IamHost": "I am the host",
         "incorrectRoomLockPassword": "Incorrect password",
         "incorrectPassword": "Incorrect username or password",
-        "inlineInstallationMsg": "You need to install our desktop sharing extension.",
-        "inlineInstallExtension": "Install now",
         "internalError": "Oops! Something went wrong. The following error occurred: {{error}}",
         "internalErrorTitle": "Internal error",
         "kickMessage": "You can contact {{participantDisplayName}} for more details.",
         "reservationErrorMsg": "Error code: {{code}}, message: {{msg}}",
         "retry": "Retry",
         "screenSharingAudio": "Share audio",
-        "screenSharingFailedToInstall": "Oops! Your screen sharing extension failed to install.",
-        "screenSharingFailedToInstallTitle": "Screen sharing extension failed to install",
-        "screenSharingFirefoxPermissionDeniedError": "Something went wrong while we were trying to share your screen. Please make sure that you have given us permission to do so.",
-        "screenSharingFirefoxPermissionDeniedTitle": "Oops! We weren’t able to start screen sharing!",
-        "screenSharingPermissionDeniedError": "Oops! Something went wrong with your screen sharing extension permissions. Please reload and try again.",
+        "screenSharingFailed": "Oops! Something went wrong, we weren’t able to start screen sharing!",
+        "screenSharingFailedTitle": "Screen sharing failed!",
+        "screenSharingPermissionDeniedError": "Oops! Something went wrong with your screen sharing permissions. Please reload and try again.",
         "sendPrivateMessage": "You recently received a private message. Did you intend to reply to that privately, or you want to send your message to the group?",
         "sendPrivateMessageCancel": "Send to the group",
         "sendPrivateMessageOk": "Send privately",

modules/UI/UI.js

     return VideoLayout.getLargeVideo();
 };
 
-/**
- * Shows "Please go to chrome webstore to install the desktop sharing extension"
- * 2 button dialog with buttons - cancel and go to web store.
- * @param url {string} the url of the extension.
- */
-UI.showExtensionExternalInstallationDialog = function(url) {
-    let openedWindow = null;
-
-    const submitFunction = function(e, v) {
-        if (v) {
-            e.preventDefault();
-            if (openedWindow === null || openedWindow.closed) {
-                openedWindow
-                    = window.open(
-                        url,
-                        'extension_store_window',
-                        'resizable,scrollbars=yes,status=1');
-            } else {
-                openedWindow.focus();
-            }
-        }
-    };
-
-    const closeFunction = function(e, v) {
-        if (openedWindow) {
-            // Ideally we would close the popup, but this does not seem to work
-            // on Chrome. Leaving it uncommented in case it could work
-            // in some version.
-            openedWindow.close();
-            openedWindow = null;
-        }
-        if (!v) {
-            eventEmitter.emit(UIEvents.EXTERNAL_INSTALLATION_CANCELED);
-        }
-    };
-
-    messageHandler.openTwoButtonDialog({
-        titleKey: 'dialog.externalInstallationTitle',
-        msgKey: 'dialog.externalInstallationMsg',
-        leftButtonKey: 'dialog.goToStore',
-        submitFunction,
-        loadedFunction: $.noop,
-        closeFunction
-    });
-};
-
-/**
- * Shows a dialog which asks user to install the extension. This one is
- * displayed after installation is triggered from the script, but fails because
- * it must be initiated by user gesture.
- * @param callback {function} function to be executed after user clicks
- * the install button - it should make another attempt to install the extension.
- */
-UI.showExtensionInlineInstallationDialog = function(callback) {
-    const submitFunction = function(e, v) {
-        if (v) {
-            callback();
-        }
-    };
-
-    const closeFunction = function(e, v) {
-        if (!v) {
-            eventEmitter.emit(UIEvents.EXTERNAL_INSTALLATION_CANCELED);
-        }
-    };
-
-    messageHandler.openTwoButtonDialog({
-        titleKey: 'dialog.externalInstallationTitle',
-        msgKey: 'dialog.inlineInstallationMsg',
-        leftButtonKey: 'dialog.inlineInstallExtension',
-        submitFunction,
-        loadedFunction: $.noop,
-        closeFunction
-    });
-};
-
 /**
  * Show shared video.
  * @param {string} id the id of the sender of the command

react/features/base/config/configWhitelist.js

     'debug',
     'debugAudioLevels',
     'defaultLanguage',
-    'desktopSharingChromeDisabled',
-    'desktopSharingChromeExtId',
-    'desktopSharingChromeMinExtVersion',
-    'desktopSharingChromeSources',
-    'desktopSharingFirefoxDisabled',
     'desktopSharingFrameRate',
     'desktopSharingSources',
     'disable1On1Mode',

react/features/base/tracks/functions.js

                 {
                     cameraDeviceId,
                     constraints,
-                    desktopSharingExtensionExternalInstallation:
-                        options.desktopSharingExtensionExternalInstallation,
                     desktopSharingFrameRate,
                     desktopSharingSourceDevice:
                         options.desktopSharingSourceDevice,

service/UI/UIEvents.js

      */
     LOCAL_FLIPX_CHANGED: 'UI.local_flipx_changed',
 
-    /**
-     * Notifies that the button "Cancel" is pressed on the dialog for
-     * external extension installation.
-     */
-    EXTERNAL_INSTALLATION_CANCELED: 'UI.external_installation_canceled',
-
     /**
      * Notifies that the side toolbar container has been toggled. The actual
      * event must contain the identifier of the container that has been toggled