[File Manager] Cleanup: Moving js/css/html files to dedicated directories

chrome/browser/resources/file_manager/js/media/audio_player.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 document.addEventListener('DOMContentLoaded', function() {
   // Test harness sets the search string to prevent the automatic load.
   // It calls AudioPlayer.load() explicitly after initializing
   // the |chrome| variable with an appropriate mock object.
   if (!document.location.search) {
     AudioPlayer.load();
@@ skipping 253 matching lines @@
 };
 
 AudioPlayer.TrackInfo.prototype.setMetadata = function(metadata) {
   if (metadata.thumbnailURL) {
     this.art_.classList.remove('blank');
     this.img_.src = metadata.thumbnailURL;
   }
   this.title_.textContent = metadata.title || this.getDefaultTitle();
   this.artist_.textContent = metadata.artist || this.getDefaultArtist();
 };