Ensures that audio tasks cannot run after AudioManager is deleted.

media/audio/mock_audio_manager.h

 // 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.
 
 #ifndef MEDIA_AUDIO_MOCK_AUDIO_MANAGER_H_
 #define MEDIA_AUDIO_MOCK_AUDIO_MANAGER_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/sequenced_task_runner_helpers.h"
 #include "media/audio/audio_manager.h"
 
 namespace media {
 
 // This class is a simple mock around AudioManager, used exclusively for tests,
 // which avoids to use the actual (system and platform dependent) AudioManager.
 // Some bots does not have input devices, thus using the actual AudioManager
 // would causing failures on classes which expect that.
 class MockAudioManager : public AudioManager {
  public:
-  class Deleter {
-   public:
-    void operator()(const MockAudioManager* instance) const;
-  };
-
-  using UniquePtr = std::unique_ptr<MockAudioManager, Deleter>;
   using GetDeviceDescriptionsCallback =
       base::RepeatingCallback<void(AudioDeviceDescriptions*)>;
 
   explicit MockAudioManager(
       scoped_refptr<base::SingleThreadTaskRunner> task_runner);
+  ~MockAudioManager() override;
+
+  void Shutdown() override;
 
   bool HasAudioOutputDevices() override;
 
   bool HasAudioInputDevices() override;
 
   base::string16 GetAudioInputDeviceModel() override;
 
   void ShowAudioInputSettings() override;
 
   void GetAudioInputDeviceDescriptions(
@@ skipping 42 matching lines @@
   void SetInputStreamParameters(const AudioParameters& params);
   void SetOutputStreamParameters(const AudioParameters& params);
   void SetDefaultOutputStreamParameters(const AudioParameters& params);
   void SetHasInputDevices(bool has_input_devices);
   void SetHasOutputDevices(bool has_output_devices);
   void SetInputDeviceDescriptionsCallback(
       GetDeviceDescriptionsCallback callback);
   void SetOutputDeviceDescriptionsCallback(
       GetDeviceDescriptionsCallback callback);
 
- protected:
-  ~MockAudioManager() override;
-
  private:
-  friend class base::DeleteHelper<MockAudioManager>;
-
   AudioParameters input_params_;
   AudioParameters output_params_;
   AudioParameters default_output_params_;
   bool has_input_devices_ = true;
   bool has_output_devices_ = true;
   GetDeviceDescriptionsCallback get_input_device_descriptions_cb_;
   GetDeviceDescriptionsCallback get_output_device_descriptions_cb_;
 
   DISALLOW_COPY_AND_ASSIGN(MockAudioManager);
 };
 
 }  // namespace media.
 
 #endif  // MEDIA_AUDIO_MOCK_AUDIO_MANAGER_H_