Remove the WEB_AUDIO compile time flag

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

 /*
  * Copyright (C) 2012, 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 13 matching lines @@
 
 #ifndef MediaStreamAudioDestinationNode_h
 #define MediaStreamAudioDestinationNode_h
 
 #include "modules/mediastream/MediaStream.h"
 #include "modules/webaudio/AudioBasicInspectorNode.h"
 #include "platform/audio/AudioBus.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassRefPtr.h"
 
-#if ENABLE(WEB_AUDIO)
-
 namespace blink {
 
 class AbstractAudioContext;
 
 class MediaStreamAudioDestinationHandler final : public AudioBasicInspectorHandler {
 public:
     static PassRefPtr<MediaStreamAudioDestinationHandler> create(AudioNode&, size_t numberOfChannels);
     ~MediaStreamAudioDestinationHandler() override;
 
     MediaStream* stream() { return m_stream.get(); }
@@ skipping 23 matching lines @@
 public:
     static MediaStreamAudioDestinationNode* create(AbstractAudioContext&, size_t numberOfChannels);
     MediaStream* stream() const;
 
 private:
     MediaStreamAudioDestinationNode(AbstractAudioContext&, size_t numberOfChannels);
 };
 
 } // namespace blink
 
-#endif // ENABLE(WEB_AUDIO)
-
 #endif // MediaStreamAudioDestinationNode_h