Pass task runners to AudioManager constructor.

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 162a4b04ceda18ca9a320f4f204c259f0fd60d07..3c8ddc6c484065fa0a3ef6184cd98730ce1238ec 100644
--- a/media/mojo/services/test_mojo_media_client.cc
+++ b/media/mojo/services/test_mojo_media_client.cc
@@ -5,6 +5,7 @@
 #include "media/mojo/services/test_mojo_media_client.h"
 
 #include "base/memory/ptr_util.h"
+#include "base/thread_task_runner_handle.h"
 #include "media/audio/audio_manager_base.h"
 #include "media/audio/audio_output_stream_sink.h"
 #include "media/base/audio_hardware_config.h"
@@ -25,12 +26,12 @@ void TestMojoMediaClient::Initialize() {
   // TODO(dalecurtis): We should find a single owner per process for the audio
   // manager or make it a lazy instance.  It's not safe to call Get()/Create()
   // across multiple threads...
-  //
-  // TODO(dalecurtis): Eventually we'll want something other than a fake audio
-  // log factory here too.  We should probably at least DVLOG() such info.
   AudioManager* audio_manager = AudioManager::Get();
-  if (!audio_manager)
-    audio_manager = media::AudioManager::Create(&fake_audio_log_factory_);
+  if (!audio_manager) {
+    audio_manager_ = media::AudioManager::CreateForTesting(
+        base::ThreadTaskRunnerHandle::Get());
+    audio_manager = audio_manager_.get();
+  }
 
   audio_hardware_config_.reset(new AudioHardwareConfig(
       audio_manager->GetInputStreamParameters(