Revert of 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 8079c166ce62b4773911abf16ca7176e0cbd0f65..a918a101b5d92ee07529abe5b5e537a64510fd07 100644
--- a/media/audio/android/audio_android_unittest.cc
+++ b/media/audio/android/audio_android_unittest.cc
@@ -415,16 +415,11 @@
  public:
   AudioAndroidOutputTest()
       : loop_(new base::MessageLoopForUI()),
-        audio_manager_(AudioManager::CreateForTesting(loop_->task_runner())),
+        audio_manager_(AudioManager::CreateForTesting()),
         audio_output_stream_(NULL) {
-    // Flush the message loop to ensure that AudioManager is fully initialized.
-    loop_->RunUntilIdle();
-  }
-
-  ~AudioAndroidOutputTest() override {
-    audio_manager_.reset();
-    loop_->RunUntilIdle();
-  }
+  }
+
+  ~AudioAndroidOutputTest() override {}
 
  protected:
   AudioManager* audio_manager() { return audio_manager_.get(); }
@@ -566,7 +561,7 @@
   }
 
   scoped_ptr<base::MessageLoopForUI> loop_;
-  ScopedAudioManagerPtr audio_manager_;
+  scoped_ptr<AudioManager> audio_manager_;
   AudioParameters audio_output_parameters_;
   AudioOutputStream* audio_output_stream_;
   base::TimeTicks start_time_;