Switch OnMoreData() to use AudioBus.

media/audio/fake_audio_output_stream.cc

Index: media/audio/fake_audio_output_stream.cc
diff --git a/media/audio/fake_audio_output_stream.cc b/media/audio/fake_audio_output_stream.cc
index aaa6158ed46c8e8364fe25885e6427e829903ec4..f09fe5dd5de4beab625c80422a07d0b27c902174 100644
--- a/media/audio/fake_audio_output_stream.cc
+++ b/media/audio/fake_audio_output_stream.cc
@@ -24,9 +24,6 @@ AudioOutputStream* FakeAudioOutputStream::MakeFakeStream(
 }
 
 bool FakeAudioOutputStream::Open() {
-  if (bytes_per_buffer_ < sizeof(int16))
-    return false;
-  buffer_.reset(new uint8[bytes_per_buffer_]);
   return true;
 }
 
@@ -37,9 +34,8 @@ FakeAudioOutputStream* FakeAudioOutputStream::GetCurrentFakeStream() {
 
 void FakeAudioOutputStream::Start(AudioSourceCallback* callback)  {
   callback_ = callback;
-  memset(buffer_.get(), 0, bytes_per_buffer_);
-  callback_->OnMoreData(buffer_.get(), bytes_per_buffer_,
-                        AudioBuffersState(0, 0));
+  audio_bus_->Zero();
+  callback_->OnMoreData(audio_bus_.get(), AudioBuffersState(0, 0));
 }
 
 void FakeAudioOutputStream::Stop() {
@@ -64,8 +60,8 @@ FakeAudioOutputStream::FakeAudioOutputStream(AudioManagerBase* manager,
     : audio_manager_(manager),
       volume_(0),
       callback_(NULL),
-      bytes_per_buffer_(params.GetBytesPerBuffer()),
       closed_(false) {
+  audio_bus_ = AudioBus::Create(params);
 }
 
 FakeAudioOutputStream::~FakeAudioOutputStream() {