Merge MediaControlsAndroid into MediaControls

Source/core/css/mediaControlsAndroid.css

 /*
  * Copyright (C) 2012 Google Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 20 matching lines @@
 }
 
 audio::-webkit-media-controls-enclosure {
     height: 35px;
 }
 
 video::-webkit-media-controls-enclosure {
     height: 40px;
 }
 
-audio::-webkit-media-controls-overlay-enclosure {
-    display: none;
-}
-
 video::-webkit-media-controls-overlay-enclosure {
     display: flex;
     position: relative;
     flex-direction: column;
     justify-content: flex-end;
     align-items: center;
     flex: 1 1;
     width: 100%;
     max-width: 800px;
     text-indent: 0;
@@ skipping 50 matching lines @@
 
 audio::-webkit-media-controls-fullscreen-button {
     display: none;
 }
 
 video::-webkit-media-controls-toggle-closed-captions-button {
     width: 35px;
     height: 35px;
     line-height: 35px;
 }