Delete MediaStreamManager in the same way as AudioManager

content/browser/renderer_host/media/media_stream_dispatcher_host_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 <string>
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "content/browser/browser_thread_impl.h"
 #include "content/browser/renderer_host/media/audio_input_device_manager.h"
@@ skipping 182 matching lines @@
     content_client_->set_browser_for_testing(host_);
   }
 
   virtual void TearDown() OVERRIDE {
     message_loop_->RunAllPending();
 
     // Recover the old browser client and content client.
     content::GetContentClient()->set_browser_for_testing(old_browser_client_);
     content::SetContentClient(old_client_);
     content_client_.reset();
+
+    // Delete the IO message loop to delete the device thread,
+    // AudioInputDeviceManager and VideoCaptureManager.
+    message_loop_.reset();
   }
 
   scoped_refptr<MockMediaStreamDispatcherHost> host_;
   scoped_ptr<MessageLoop> message_loop_;
   scoped_ptr<BrowserThreadImpl> io_thread_;
   scoped_ptr<media::AudioManager> audio_manager_;
   scoped_ptr<MediaStreamManager> media_stream_manager_;
   content::ContentClient* old_client_;
   content::ContentBrowserClient* old_browser_client_;
   scoped_ptr<content::ContentClient> content_client_;
@@ skipping 118 matching lines @@
   EXPECT_EQ(host_->video_devices_.size(), 0u);
   EXPECT_EQ(host_->NumberOfStreams(), 1u);
 
   // TODO(perkj): test audio device failure?
 
   host_->OnStopGeneratedStream(label);
   EXPECT_EQ(host_->NumberOfStreams(), 0u);
 }
 
 };  // namespace media_stream