Remove obsolate PlatformElements.native.js

react/features/base/styles/components/styles/PlatformElements.native.js

-import { ColorPalette } from './ColorPalette';
-import { BoxModel } from './BoxModel';
-
-import {
-    createStyleSheet
-} from '../../functions';
-
-export const PlatformElements = createStyleSheet({
-
-    /**
-     * Platform specific header button (e.g. back, menu...etc).
-     */
-    headerButton: {
-        alignSelf: 'center',
-        color: ColorPalette.white,
-        fontSize: 26,
-        paddingRight: 22
-    },
-
-    /**
-     * Generic style for a label placed in the header.
-     */
-    headerText: {
-        color: ColorPalette.white,
-        fontSize: 20
-    },
-
-    /**
-     * An empty padded view to place components.
-     */
-    paddedView: {
-        padding: BoxModel.padding
-    },
-
-    /**
-     * The topmost level element of a page.
-     */
-    page: {
-        alignItems: 'stretch',
-        bottom: 0,
-        flex: 1,
-        flexDirection: 'column',
-        left: 0,
-        overflow: 'hidden',
-        position: 'absolute',
-        right: 0,
-        top: 0
-    }
-});

react/features/base/styles/components/styles/index.js

 export * from './BoxModel';
 export * from './ColorPalette';
-export * from './PlatformElements';

react/features/welcome/components/WelcomePage.native.js

 import { MEDIA_TYPE } from '../../base/media';
 import { updateProfile } from '../../base/profile';
 import { LoadingIndicator, Header, Text } from '../../base/react';
-import { ColorPalette, PlatformElements } from '../../base/styles';
+import { ColorPalette } from '../../base/styles';
 import {
     createDesiredLocalTracks,
     destroyLocalTracks
                         </View>
                     </Header>
                     <SafeAreaView style = { styles.roomContainer } >
-                        <View style = { PlatformElements.paddedView } >
+                        <View style = { styles.joinControls } >
                             <TextInput
                                 accessibilityLabel = { 'Input room name.' }
                                 autoCapitalize = 'none'

react/features/welcome/components/styles.js

         paddingTop: 10
     },
 
+    /**
+     * A view that contains the field and hint box.
+     */
+    joinControls: {
+        padding: BoxModel.padding
+    },
+
     /**
      * The style of the top-level container/{@code View} of
      * {@code LocalVideoTrackUnderlay}.