mac: Prepare for -Wunused-functions.

media/audio/mac/audio_auhal_mac.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/audio/mac/audio_auhal_mac.h"
 
 #include <CoreServices/CoreServices.h>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/mac/mac_logging.h"
 #include "media/audio/mac/audio_manager_mac.h"
 #include "media/base/media_switches.h"
 
 namespace media {
 
-static std::ostream& operator<<(std::ostream& os,
-                                const AudioStreamBasicDescription& format) {
-  os << "sample rate       : " << format.mSampleRate << std::endl
-     << "format ID         : " << format.mFormatID << std::endl
-     << "format flags      : " << format.mFormatFlags << std::endl
-     << "bytes per packet  : " << format.mBytesPerPacket << std::endl
-     << "frames per packet : " << format.mFramesPerPacket << std::endl
-     << "bytes per frame   : " << format.mBytesPerFrame << std::endl
-     << "channels per frame: " << format.mChannelsPerFrame << std::endl
-     << "bits per channel  : " << format.mBitsPerChannel;
-  return os;
-}
-
 static void ZeroBufferList(AudioBufferList* buffer_list) {
   for (size_t i = 0; i < buffer_list->mNumberBuffers; ++i) {
     memset(buffer_list->mBuffers[i].mData,
            0,
            buffer_list->mBuffers[i].mDataByteSize);
   }
 }
 
 static void WrapBufferList(AudioBufferList* buffer_list,
                            AudioBus* bus,
@@ skipping 494 matching lines @@
   result = AudioUnitInitialize(audio_unit_);
   if (result != noErr) {
     OSSTATUS_DLOG(ERROR, result) << "AudioUnitInitialize() failed.";
     return false;
   }
 
   return true;
 }
 
 }  // namespace media