Pass task runners to AudioManager constructor.

content/browser/renderer_host/media/audio_input_device_manager_unittest.cc

Index: content/browser/renderer_host/media/audio_input_device_manager_unittest.cc
diff --git a/content/browser/renderer_host/media/audio_input_device_manager_unittest.cc b/content/browser/renderer_host/media/audio_input_device_manager_unittest.cc
index 4fac69d7dda1061c9410aa089a463030e7ef8f20..aa90149567a9ccbc643950bd775ec9794508a24a 100644
--- a/content/browser/renderer_host/media/audio_input_device_manager_unittest.cc
+++ b/content/browser/renderer_host/media/audio_input_device_manager_unittest.cc
@@ -65,13 +65,8 @@ class MAYBE_AudioInputDeviceManagerTest : public testing::Test {
     message_loop_.reset(new base::MessageLoopForIO);
     io_thread_.reset(new BrowserThreadImpl(BrowserThread::IO,
                                            message_loop_.get()));
-    audio_manager_.reset(media::AudioManager::CreateForTesting());
-    // Wait for audio thread initialization to complete.  Otherwise the
-    // enumeration type may not have been set yet.
-    base::WaitableEvent event(false, false);
-    audio_manager_->GetTaskRunner()->PostTask(FROM_HERE, base::Bind(
-        &base::WaitableEvent::Signal, base::Unretained(&event)));
-    event.Wait();
+    audio_manager_ =
+        media::AudioManager::CreateForTesting(message_loop_->task_runner());
     manager_ = new AudioInputDeviceManager(audio_manager_.get());
     manager_->UseFakeDevice();
     audio_input_listener_.reset(new MockAudioInputDeviceManagerListener());
@@ -98,7 +93,7 @@ class MAYBE_AudioInputDeviceManagerTest : public testing::Test {
   scoped_ptr<BrowserThreadImpl> io_thread_;
   scoped_refptr<AudioInputDeviceManager> manager_;
   scoped_ptr<MockAudioInputDeviceManagerListener> audio_input_listener_;
-  scoped_ptr<media::AudioManager> audio_manager_;
+  media::ScopedAudioManagerPtr audio_manager_;
   StreamDeviceInfoArray devices_;
 
  private: