Convert WebAudio file handlers to use AudioBus.

media/audio/audio_util.h

Index: media/audio/audio_util.h
diff --git a/media/audio/audio_util.h b/media/audio/audio_util.h
index 9931935c2349a689d21d7dba41009879186b4570..d5522ccd57ea50453867494a8da4ee01f19ba98b 100644
--- a/media/audio/audio_util.h
+++ b/media/audio/audio_util.h
@@ -67,19 +67,6 @@ MEDIA_EXPORT bool FoldChannels(void* buf,
                                int bytes_per_sample,
                                float volume);
 
-// DeinterleaveAudioChannel() takes interleaved audio buffer |source|
-// of the given |sample_fmt| and |number_of_channels| and extracts
-// |number_of_frames| data for the given |channel_index| and
-// puts it in the floating point |destination|.
-// It returns |true| on success, or |false| if the |sample_fmt| is
-// not recognized.
-MEDIA_EXPORT bool DeinterleaveAudioChannel(void* source,
-                                           float* destination,
-                                           int channels,
-                                           int channel_index,
-                                           int bytes_per_sample,
-                                           size_t number_of_frames);
-
 // Returns the default audio output hardware sample-rate.
 MEDIA_EXPORT int GetAudioHardwareSampleRate();