Revert of media: Shutdown AudioManager in TestMojoMediaClient

media/mojo/services/test_mojo_media_client.cc

Index: media/mojo/services/test_mojo_media_client.cc
diff --git a/media/mojo/services/test_mojo_media_client.cc b/media/mojo/services/test_mojo_media_client.cc
index 1968e113bff74c09926197103e43ac2e9b9ebcc1..1e380c1f527a177b74c422fde8c908d18d16a680 100644
--- a/media/mojo/services/test_mojo_media_client.cc
+++ b/media/mojo/services/test_mojo_media_client.cc
@@ -27,11 +27,11 @@
 
 TestMojoMediaClient::~TestMojoMediaClient() {
   DVLOG(1) << __func__;
-
-  if (audio_manager_) {
-    audio_manager_->Shutdown();
-    audio_manager_.reset();
-  }
+  // AudioManager destructor requires MessageLoop.
+  // Destroy it before the message loop goes away.
+  audio_manager_.reset();
+  // Flush the message loop to ensure that the audio manager is destroyed.
+  base::RunLoop().RunUntilIdle();
 }
 
 void TestMojoMediaClient::Initialize(
@@ -44,6 +44,7 @@
   if (!audio_manager) {
     audio_manager_ = media::AudioManager::CreateForTesting(
         base::MakeUnique<AudioThreadImpl>());
+    audio_manager = audio_manager_.get();
     // Flush the message loop to ensure that the audio manager is initialized.
     base::RunLoop().RunUntilIdle();
   }