Revert of Pass task runners to AudioManager constructor.

content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc

Index: content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc
diff --git a/content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc b/content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc
index 5560d0e0f760027de95a69981b8ded4a3323e9e5..0c18286db4fcd1db86ffe5e5e6ae67b856ad296a 100644
--- a/content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc
+++ b/content/browser/renderer_host/media/media_stream_dispatcher_host_unittest.cc
@@ -225,8 +225,8 @@
 class MediaStreamDispatcherHostTest : public testing::Test {
  public:
   MediaStreamDispatcherHostTest()
-      : thread_bundle_(content::TestBrowserThreadBundle::IO_MAINLOOP),
-        old_browser_client_(NULL),
+      : old_browser_client_(NULL),
+        thread_bundle_(content::TestBrowserThreadBundle::IO_MAINLOOP),
         origin_("https://test.com") {
     audio_manager_.reset(
         new media::MockAudioManager(base::ThreadTaskRunnerHandle::Get()));
@@ -422,13 +422,12 @@
   }
 
   scoped_refptr<MockMediaStreamDispatcherHost> host_;
+  std::unique_ptr<media::AudioManager> audio_manager_;
   std::unique_ptr<MediaStreamManager> media_stream_manager_;
-  content::TestBrowserThreadBundle thread_bundle_;
-  std::unique_ptr<media::AudioManager, media::AudioManagerDeleter>
-      audio_manager_;
   MockMediaStreamUIProxy* stream_ui_;
   ContentBrowserClient* old_browser_client_;
   std::unique_ptr<ContentClient> content_client_;
+  content::TestBrowserThreadBundle thread_bundle_;
   content::TestBrowserContext browser_context_;
   media::AudioDeviceNames physical_audio_devices_;
   media::VideoCaptureDevice::Names physical_video_devices_;