Remove the WEB_AUDIO compile time flag

third_party/WebKit/Source/platform/mediastream/MediaStreamWebAudioSource.h

 /*
  * Copyright 2014 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 20 matching lines @@
 #ifndef MediaStreamWebAudioSource_h
 #define MediaStreamWebAudioSource_h
 
 #include "platform/audio/AudioSourceProvider.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/ThreadingPrimitives.h"
 #include "wtf/build_config.h"
 
-#if ENABLE(WEB_AUDIO)
-
 namespace blink {
 
 class WebAudioSourceProvider;
 
 class MediaStreamWebAudioSource : public AudioSourceProvider {
     WTF_MAKE_NONCOPYABLE(MediaStreamWebAudioSource);
 public:
     static PassOwnPtr<MediaStreamWebAudioSource> create(PassOwnPtr<WebAudioSourceProvider> provider) { return adoptPtr(new MediaStreamWebAudioSource(std::move(provider))); }
 
     ~MediaStreamWebAudioSource() override;
 
 private:
     explicit MediaStreamWebAudioSource(PassOwnPtr<WebAudioSourceProvider>);
 
     // blink::AudioSourceProvider implementation.
     void provideInput(AudioBus*, size_t framesToProcess) override;
 
     OwnPtr<WebAudioSourceProvider> m_webAudioSourceProvider;
 };
 
 } // namespace blink
 
-#endif // ENABLE(WEB_AUDIO)
-
 #endif // MediaStreamWebAudioSource_h