Remove duplicated headers from platform/

Source/platform/audio/AudioBus.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
@@ skipping 22 matching lines @@
 #include "platform/audio/AudioBus.h"
 
 #include "platform/audio/DenormalDisabler.h"
 
 #include <assert.h>
 #include <math.h>
 #include <algorithm>
 #include "platform/audio/SincResampler.h"
 #include "platform/audio/VectorMath.h"
 #include "wtf/OwnPtr.h"
-#include "wtf/PassOwnPtr.h"
 
 namespace WebCore {
 
 using namespace VectorMath;
 
 const unsigned MaxBusChannels = 32;
 
 PassRefPtr<AudioBus> AudioBus::create(unsigned numberOfChannels, size_t length, bool allocate)
 {
     ASSERT(numberOfChannels <= MaxBusChannels);
@@ skipping 575 matching lines @@
 
 void AudioBus::clearSilentFlag()
 {
     for (size_t i = 0; i < m_channels.size(); ++i)
         m_channels[i]->clearSilentFlag();
 }
 
 } // WebCore
 
 #endif // ENABLE(WEB_AUDIO)