Moved AudioUtil static functions to AudioManager interfaces

media/audio/mac/audio_low_latency_output_mac.cc

Index: media/audio/mac/audio_low_latency_output_mac.cc
diff --git a/media/audio/mac/audio_low_latency_output_mac.cc b/media/audio/mac/audio_low_latency_output_mac.cc
index 6ab0ead56d7b467dc0c7e50cabbb942788a2483c..4b82befc7850dcb4aa08553de5e96306ff922b67 100644
--- a/media/audio/mac/audio_low_latency_output_mac.cc
+++ b/media/audio/mac/audio_low_latency_output_mac.cc
@@ -81,7 +81,10 @@ AUAudioOutputStream::AUAudioOutputStream(
   // Calculate the number of sample frames per callback.
   number_of_frames_ = params.GetBytesPerBuffer() / format_.mBytesPerPacket;
   DVLOG(1) << "Number of frames per callback: " << number_of_frames_;
-  CHECK_EQ(number_of_frames_, GetAudioHardwareBufferSize());
+  const AudioParameters parameters =
+      manager_->GetDefaultOutputStreamParameters();
+  CHECK_EQ(number_of_frames_,
+           static_cast<size_t>(parameters.frames_per_buffer()));
 }
 
 AUAudioOutputStream::~AUAudioOutputStream() {
@@ -167,7 +170,8 @@ bool AUAudioOutputStream::Configure() {
   // Set the buffer frame size.
   // WARNING: Setting this value changes the frame size for all audio units in
   // the current process.  It's imperative that the input and output frame sizes
-  // be the same as audio_util::GetAudioHardwareBufferSize().
+  // be the same as the frames_per_buffer() returned by
+  // GetDefaultOutputStreamParameters.
   // See http://crbug.com/154352 for details.
   UInt32 buffer_size = number_of_frames_;
   result = AudioUnitSetProperty(