[WebUI] Fix rest of CSS style nits in misc. dirs so I can turn on CSS checker.

chrome/browser/resources/file_manager/css/media_controls.css

 /* 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.
- */
+ * found in the LICENSE file. */
 
 .media-button {
   background-position: center center;
   background-repeat: no-repeat;
   height: 28px;
   position: relative;
   width: 28px;
 }
 
 .media-button > div {
@@ skipping 453 matching lines @@
   opacity: 0;
 }
 
 .playback-state-icon[state='play'] {
   background-image: url(../images/media/media_play.png);
 }
 
 .playback-state-icon[state='pause'] {
   background-image: url(../images/media/media_pause.png);
 }