fix(UI) removed unused methods

modules/API/API.js

 } from '../../react/features/base/participants';
 import { updateSettings } from '../../react/features/base/settings';
 import { isToggleCameraEnabled, toggleCamera } from '../../react/features/base/tracks';
-import { setPrivateMessageRecipient } from '../../react/features/chat/actions';
+import {
+    setPrivateMessageRecipient,
+    toggleChat
+} from '../../react/features/chat/actions';
 import { openChat } from '../../react/features/chat/actions.web';
 import {
     processExternalDeviceRequest
         },
         'toggle-chat': () => {
             sendAnalytics(createApiEvent('chat.toggled'));
-            APP.UI.toggleChat();
+            APP.store.dispatch(toggleChat());
         },
         'toggle-raise-hand': () => {
             const localParticipant = getLocalParticipant(APP.store.getState());
                 const { isOpen: isChatOpen } = state['features/chat'];
 
                 if (!isChatOpen) {
-                    APP.UI.toggleChat();
+                    APP.store.dispatch(toggleChat());
                 }
                 APP.store.dispatch(openChat(participant));
             } else {

modules/UI/UI.js

 
 import { isMobileBrowser } from '../../react/features/base/environment/utils';
 import { setColorAlpha } from '../../react/features/base/util';
-import { toggleChat } from '../../react/features/chat';
 import { setDocumentUrl } from '../../react/features/etherpad';
 import { setFilmstripVisible } from '../../react/features/filmstrip';
 import { joinLeaveNotificationsDisabled, setNotificationsEnabled } from '../../react/features/notifications';
     UI.showToolbar();
 };
 
-/**
- * Returns the shared document manager object.
- * @return {EtherpadManager} the shared document manager object
- */
-UI.getSharedVideoManager = function() {
-    return sharedVideoManager;
-};
-
 /**
  * Starts the UI module and initializes all related components.
  *
     APP.store.dispatch(setFilmstripVisible(!visible));
 };
 
-/**
- * Toggles the visibility of the chat panel.
- */
-UI.toggleChat = () => APP.store.dispatch(toggleChat());
-
 /**
  * Sets muted audio state for participant
  */
     eventEmitter.removeAllListeners();
 };
 
-/**
- * Removes the given listener for the given type of event.
- *
- * @param type the type of the event we're listening for
- * @param listener the listener we want to remove
- */
-UI.removeListener = function(type, listener) {
-    eventEmitter.removeListener(type, listener);
-};
-
 /**
  * Emits the event of given type by specifying the parameters in options.
  *

modules/UI/util/MessageHandler.js

         };
     },
 
-    /**
-     * Shows a dialog with different states to the user.
-     *
-     * @param statesObject object containing all the states of the dialog.
-     * @param options impromptu options
-     * @param translateOptions options passed to translation
-     */
-    openDialogWithStates(statesObject, options, translateOptions) {
-        const { classes, size } = options;
-        const defaultClasses = this._getDialogClasses(size);
-
-        options.classes = Object.assign({}, defaultClasses, classes);
-        options.promptspeed = options.promptspeed || 0;
-
-        for (const state in statesObject) { // eslint-disable-line guard-for-in
-            const currentState = statesObject[state];
-
-            if (currentState.titleKey) {
-                currentState.title
-                    = this._getFormattedTitleString(currentState.titleKey);
-            }
-        }
-        const dialog = $.prompt(statesObject, options);
-
-        APP.translation.translateElement(dialog, translateOptions);
-
-        return $.prompt.getApi();
-    },
-
     /**
      * Opens new popup window for given <tt>url</tt> centered over current
      * window.
             title: displayName
         },
         timeout));
-    },
-
-    /**
-     * Displays a notification.
-     *
-     * @param {string} titleKey - The key from the language file for the title
-     * of the notification.
-     * @param {string} messageKey - The key from the language file for the text
-     * of the message.
-     * @param {Object} messageArguments - The arguments for the message
-     * translation.
-     * @returns {void}
-     */
-    notify(titleKey, messageKey, messageArguments) {
-        this.participantNotification(
-            null, titleKey, null, messageKey, messageArguments);
     }
 };