Ensures that audio tasks cannot run after AudioManager is deleted.

media/audio/fake_audio_manager.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/fake_audio_manager.h"
 
 #include <algorithm>
 #include <utility>
 
 namespace media {
 
 namespace {
 
 const int kDefaultInputBufferSize = 1024;
 const int kDefaultSampleRate = 48000;
 
 }  // namespace
 
 FakeAudioManager::FakeAudioManager(
     scoped_refptr<base::SingleThreadTaskRunner> task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
     AudioLogFactory* audio_log_factory)
     : AudioManagerBase(std::move(task_runner),
                        std::move(worker_task_runner),
                        audio_log_factory) {
 }
 
-FakeAudioManager::~FakeAudioManager() {
-  Shutdown();
-}
+FakeAudioManager::~FakeAudioManager() = default;
 
 // Implementation of AudioManager.
 bool FakeAudioManager::HasAudioOutputDevices() { return false; }
 
 bool FakeAudioManager::HasAudioInputDevices() { return false; }
 
 const char* FakeAudioManager::GetName() {
   return "Fake";
 }
 
@@ skipping 46 matching lines @@
 }
 
 AudioParameters FakeAudioManager::GetInputStreamParameters(
     const std::string& device_id) {
   return AudioParameters(
       AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
       kDefaultSampleRate, 16, kDefaultInputBufferSize);
 }
 
 }  // namespace media