Fix invalid bind usage during AudioManagerBase construction.

media/audio/mock_audio_manager.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 "media/audio/mock_audio_manager.h"
 
 #include "base/logging.h"
 #include "base/message_loop_proxy.h"
 
 namespace media {
@@ skipping 56 matching lines @@
 }
 
 void MockAudioManager::AddOutputDeviceChangeListener(
     AudioDeviceListener* listener) {
 }
 
 void MockAudioManager::RemoveOutputDeviceChangeListener(
     AudioDeviceListener* listener) {
 }
 
+void MockAudioManager::InitializeOnAudioThread() {
+}
+
 }  // namespace media.