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..8079c166ce62b4773911abf16ca7176e0cbd0f65 100644
--- a/media/audio/android/audio_android_unittest.cc
+++ b/media/audio/android/audio_android_unittest.cc
@@ -415,11 +415,16 @@ 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 {}
+  ~AudioAndroidOutputTest() override {
+    audio_manager_.reset();
+    loop_->RunUntilIdle();
+  }
 
  protected:
   AudioManager* audio_manager() { return audio_manager_.get(); }
@@ -561,7 +566,7 @@ 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_;