Re-land r207105 (Mac audio capture threading fix) with unit test memory leak issue resolved.

media/audio/fake_audio_consumer_unittest.cc

 // Copyright (c) 2012 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 "base/bind.h"
 #include "base/message_loop.h"
 #include "base/time.h"
 #include "media/audio/audio_buffers_state.h"
+#include "media/audio/audio_parameters.h"
 #include "media/audio/fake_audio_consumer.h"
 #include "media/audio/simple_sources.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace media {
 
 static const int kTestCallbacks = 5;
 
 class FakeAudioConsumerTest : public testing::Test {
  public:
@@ skipping 114 matching lines @@
   // chance of catching the FakeAudioOutputStream doing the wrong thing.
   message_loop_.PostDelayedTask(FROM_HERE, base::Bind(
       &FakeAudioConsumerTest::StopStartOnAudioThread,
       base::Unretained(this)), time_between_callbacks_ / 2);
 
   // EndTest() will ensure the proper number of callbacks have occurred.
   message_loop_.Run();
 }
 
 }  // namespace media