Pass task runners to AudioManager constructor.

media/audio/android/audio_android_unittest.cc

Index: media/audio/android/audio_android_unittest.cc
diff --git a/media/audio/android/audio_android_unittest.cc b/media/audio/android/audio_android_unittest.cc
index a918a101b5d92ee07529abe5b5e537a64510fd07..761481932423ce46f3542b885bfe64484f144875 100644
--- a/media/audio/android/audio_android_unittest.cc
+++ b/media/audio/android/audio_android_unittest.cc
@@ -415,8 +415,10 @@ class AudioAndroidOutputTest : public testing::Test {
  public:
   AudioAndroidOutputTest()
       : loop_(new base::MessageLoopForUI()),
-        audio_manager_(AudioManager::CreateForTesting()),
+        audio_manager_(AudioManager::CreateForTesting(loop_->task_runner())),
         audio_output_stream_(NULL) {
+    // Flush the message loop to ensure that AudioManager is fully initialized.
+    loop_->RunUntilIdle();
   }
 
   ~AudioAndroidOutputTest() override {}
@@ -561,7 +563,7 @@ class AudioAndroidOutputTest : public testing::Test {
   }
 
   scoped_ptr<base::MessageLoopForUI> loop_;
-  scoped_ptr<AudioManager> audio_manager_;
+  ScopedAudioManagerPtr audio_manager_;
   AudioParameters audio_output_parameters_;
   AudioOutputStream* audio_output_stream_;
   base::TimeTicks start_time_;