Remove the WEB_AUDIO compile time flag

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

 /*
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 #include "platform/audio/AudioBus.h"
-
-#if ENABLE(WEB_AUDIO)
 #include "platform/audio/AudioFileReader.h"
 #include "platform/audio/DenormalDisabler.h"
 #include "platform/audio/SincResampler.h"
 #include "platform/audio/VectorMath.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebAudioBus.h"
 #include "wtf/OwnPtr.h"
 #include <assert.h>
 #include <math.h>
 #include <algorithm>
@@ skipping 636 matching lines @@
 
     // If the bus needs no conversion then return as is.
     if ((!mixToMono || audioBus->numberOfChannels() == 1) && audioBus->sampleRate() == sampleRate)
         return audioBus;
 
     return AudioBus::createBySampleRateConverting(audioBus.get(), mixToMono, sampleRate);
 }
 
 } // namespace blink
 
-#endif // ENABLE(WEB_AUDIO)