Ensures that audio tasks cannot run after AudioManager is deleted.

content/browser/speech/speech_recognizer_impl_unittest.cc

 // Copyright (c) 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 <stddef.h>
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/run_loop.h"
@@ skipping 200 matching lines @@
     // Runs the loop and waits for the |audio_thread_| to call event's closure,
     // which means AudioSystem reply containing device parameters is already
     // queued on the main thread.
     event.RunAndWait();
   }
 
  protected:
   TestBrowserThreadBundle thread_bundle_;
   scoped_refptr<SpeechRecognizerImpl> recognizer_;
   base::Thread audio_thread_;
-  media::MockAudioManager::UniquePtr audio_manager_;
+  std::unique_ptr<media::MockAudioManager> audio_manager_;
   std::unique_ptr<media::AudioSystem> audio_system_;
   bool recognition_started_;
   bool recognition_ended_;
   bool result_received_;
   bool audio_started_;
   bool audio_ended_;
   bool sound_started_;
   bool sound_ended_;
   SpeechRecognitionErrorCode error_;
   net::TestURLFetcherFactory url_fetcher_factory_;
@@ skipping 416 matching lines @@
 
   EXPECT_EQ(SPEECH_RECOGNITION_ERROR_NONE, error_);
   EXPECT_FALSE(audio_ended_);
   EXPECT_FALSE(recognition_ended_);
   recognizer_->AbortRecognition();
   base::RunLoop().RunUntilIdle();
   CheckFinalEventsConsistency();
 }
 
 }  // namespace content