Ensures that audio tasks cannot run after AudioManager is deleted.

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/callback.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
 #include "media/base/audio_parameters.h"
 
 namespace media {
 
-void MockAudioManager::Deleter::operator()(
-    const MockAudioManager* instance) const {
-  CHECK(instance);
-  if (instance->GetTaskRunner()->BelongsToCurrentThread()) {
-    delete instance;
-    return;
-  }
-  // AudioManager must be destroyed on the audio thread.
-  if (!instance->GetTaskRunner()->DeleteSoon(FROM_HERE, instance)) {
-    LOG(WARNING) << "Failed to delete AudioManager instance.";
-  }
-}
-
 MockAudioManager::MockAudioManager(
     scoped_refptr<base::SingleThreadTaskRunner> task_runner)
     : AudioManager(task_runner, task_runner) {}
 
 MockAudioManager::~MockAudioManager() {
 }
 
+void MockAudioManager::Shutdown() {}
+
 bool MockAudioManager::HasAudioOutputDevices() {
   DCHECK(GetTaskRunner()->BelongsToCurrentThread());
   return has_output_devices_;
 }
 
 bool MockAudioManager::HasAudioInputDevices() {
   DCHECK(GetTaskRunner()->BelongsToCurrentThread());
   return has_input_devices_;
 }
 
@@ skipping 117 matching lines @@
     GetDeviceDescriptionsCallback callback) {
   get_input_device_descriptions_cb_ = std::move(callback);
 }
 
 void MockAudioManager::SetOutputDeviceDescriptionsCallback(
     GetDeviceDescriptionsCallback callback) {
   get_output_device_descriptions_cb_ = std::move(callback);
 }
 
 }  // namespace media.