Add more missing closing namespace comments.

third_party/WebKit/Source/platform/audio/AudioUtilities.cpp

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * 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 55 matching lines @@
 {
     // crbug.com/344375
     return 3000;
 }
 
 float maxAudioBufferSampleRate()
 {
     // Windows can support audio sampling rates this high, so allow AudioBuffer rates this high as well.
     return 192000;
 }
-} // AudioUtilites
+} // namespace AudioUtilities
 
 } // namespace blink