Pass task runners to AudioManager constructor.

media/audio/sounds/sounds_manager_unittest.cc

Index: media/audio/sounds/sounds_manager_unittest.cc
diff --git a/media/audio/sounds/sounds_manager_unittest.cc b/media/audio/sounds/sounds_manager_unittest.cc
index 6dfcf11939efa994248229f56e5c75048a7d684e..21f5c65356d7a2ee607af5db96dfa684178c0dc8 100644
--- a/media/audio/sounds/sounds_manager_unittest.cc
+++ b/media/audio/sounds/sounds_manager_unittest.cc
@@ -7,10 +7,10 @@
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/string_piece.h"
+#include "base/test/test_message_loop.h"
+#include "base/thread_task_runner_handle.h"
 #include "media/audio/audio_manager.h"
 #include "media/audio/simple_sources.h"
 #include "media/audio/sounds/audio_stream_handler.h"
@@ -26,13 +26,15 @@ class SoundsManagerTest : public testing::Test {
   ~SoundsManagerTest() override {}
 
   void SetUp() override {
-    audio_manager_.reset(AudioManager::CreateForTesting());
+    audio_manager_ =
+        AudioManager::CreateForTesting(base::ThreadTaskRunnerHandle::Get());
     SoundsManager::Create();
+    base::RunLoop().RunUntilIdle();
   }
 
   void TearDown() override {
     SoundsManager::Shutdown();
-    audio_manager_.reset();
+    base::RunLoop().RunUntilIdle();
   }
 
   void SetObserverForTesting(AudioStreamHandler::TestObserver* observer) {
@@ -45,9 +47,8 @@ class SoundsManagerTest : public testing::Test {
   }
 
  private:
-  scoped_ptr<AudioManager> audio_manager_;
-
-  base::MessageLoop message_loop_;
+  base::TestMessageLoop message_loop_;
+  ScopedAudioManagerPtr audio_manager_;
 };
 
 TEST_F(SoundsManagerTest, Play) {