Remove the WEB_AUDIO compile time flag

third_party/WebKit/Source/modules/webaudio/AsyncAudioDecoder.h

 /*
  * Copyright (C) 2011, 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 12 matching lines @@
  */
 
 #ifndef AsyncAudioDecoder_h
 #define AsyncAudioDecoder_h
 
 #include "platform/heap/Handle.h"
 #include "public/platform/WebThread.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/build_config.h"
 
-#if ENABLE(WEB_AUDIO)
-
 namespace blink {
 
 class AudioBuffer;
 class AudioBufferCallback;
 class AudioBus;
 class DOMArrayBuffer;
 
 // AsyncAudioDecoder asynchronously decodes audio file data from a DOMArrayBuffer in a worker thread.
 // Upon successful decoding, a completion callback will be invoked with the decoded PCM data in an AudioBuffer.
 
@@ skipping 10 matching lines @@
 private:
     AudioBuffer* createAudioBufferFromAudioBus(AudioBus*);
     static void decode(DOMArrayBuffer* audioData, float sampleRate, AudioBufferCallback* successCallback, AudioBufferCallback* errorCallback);
     static void notifyComplete(DOMArrayBuffer* audioData, AudioBufferCallback* successCallback, AudioBufferCallback* errorCallback, AudioBus*);
 
     OwnPtr<WebThread> m_thread;
 };
 
 } // namespace blink
 
-#endif // ENABLE(WEB_AUDIO)
-
 #endif // AsyncAudioDecoder_h