Ensures that audio tasks cannot run after AudioManager is deleted.

media/audio/win/audio_output_win_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 <windows.h>
 #include <mmsystem.h>
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 146 matching lines @@
         AudioManager::CreateForTesting(message_loop_.task_runner());
     base::RunLoop().RunUntilIdle();
   }
   ~WinAudioTest() override {
     audio_manager_.reset();
     base::RunLoop().RunUntilIdle();
   }
 
  protected:
   base::MessageLoop message_loop_;
-  ScopedAudioManagerPtr audio_manager_;
+  std::unique_ptr<AudioManager> audio_manager_;
 };
 
 // ===========================================================================
 // Validation of AudioManager::AUDIO_PCM_LINEAR
 //
 // NOTE:
 // The tests can fail on the build bots when somebody connects to them via
 // remote-desktop and the rdp client installs an audio device that fails to open
 // at some point, possibly when the connection goes idle.
 
@@ skipping 480 matching lines @@
   oas->Start(&source);
 
   ::WaitForSingleObject(thread, INFINITE);
   ::CloseHandle(thread);
 
   oas->Stop();
   oas->Close();
 }
 
 }  // namespace media