Ensures that audio tasks cannot run after AudioManager is deleted.

content/browser/renderer_host/media/audio_input_device_manager_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 "content/browser/renderer_host/media/audio_input_device_manager.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
@@ skipping 72 matching lines @@
     base::RunLoop().RunUntilIdle();
   }
 
   void TearDown() override {
     manager_->UnregisterListener(audio_input_listener_.get());
   }
 
   TestBrowserThreadBundle thread_bundle_;
   scoped_refptr<AudioInputDeviceManager> manager_;
   std::unique_ptr<MockAudioInputDeviceManagerListener> audio_input_listener_;
-  media::ScopedAudioManagerPtr audio_manager_;
+  std::unique_ptr<media::AudioManager> audio_manager_;
   StreamDeviceInfoArray devices_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MAYBE_AudioInputDeviceManagerTest);
 };
 
 // Opens and closes the devices.
 TEST_F(MAYBE_AudioInputDeviceManagerTest, OpenAndCloseDevice) {
   ASSERT_FALSE(devices_.empty());
 
@@ skipping 168 matching lines @@
   DCHECK(!info);
 
   manager_->Close(session_id);
   EXPECT_CALL(*audio_input_listener_,
               Closed(MEDIA_DEVICE_AUDIO_CAPTURE, session_id))
       .Times(1);
   base::RunLoop().RunUntilIdle();
 }
 
 }  // namespace content