Ensures that audio tasks cannot run after AudioManager is deleted.

media/audio/win/audio_low_latency_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 "media/audio/win/audio_low_latency_output_win.h"
 
 #include <windows.h>
 #include <mmsystem.h>
 #include <stddef.h>
 #include <stdint.h>
@@ skipping 227 matching lines @@
         AudioManager::CreateForTesting(message_loop_.task_runner());
     base::RunLoop().RunUntilIdle();
   }
   ~WASAPIAudioOutputStreamTest() override {
     audio_manager_.reset();
     base::RunLoop().RunUntilIdle();
   }
 
  protected:
   base::MessageLoopForUI message_loop_;
-  ScopedAudioManagerPtr audio_manager_;
+  std::unique_ptr<AudioManager> audio_manager_;
 };
 
 // Test Create(), Close() calling sequence.
 TEST_F(WASAPIAudioOutputStreamTest, CreateAndClose) {
   ABORT_AUDIO_TEST_IF_NOT(HasCoreAudioAndOutputDevices(audio_manager_.get()));
   AudioOutputStream* aos = CreateDefaultAudioOutputStream(audio_manager_.get());
   aos->Close();
 }
 
 // Test Open(), Close() calling sequence.
@@ skipping 353 matching lines @@
   aos->Start(&source);
   message_loop_.task_runner()->PostDelayedTask(
       FROM_HERE, base::MessageLoop::QuitWhenIdleClosure(),
       TestTimeouts::action_timeout());
   base::RunLoop().Run();
   aos->Stop();
   aos->Close();
 }
 
 }  // namespace media