Replace MessageLoopProxy with SingleThreadTaskRunner for the rest of media/.

media/audio/sounds/sounds_manager.cc

Index: media/audio/sounds/sounds_manager.cc
diff --git a/media/audio/sounds/sounds_manager.cc b/media/audio/sounds/sounds_manager.cc
index e93dc6588dde598ef27263eaa4f351b543a5d808..de6ff094d6e3fe750e5ac58ac968ae9b67f2e7c0 100644
--- a/media/audio/sounds/sounds_manager.cc
+++ b/media/audio/sounds/sounds_manager.cc
@@ -9,7 +9,7 @@
 #include "base/logging.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
-#include "base/message_loop/message_loop_proxy.h"
+#include "base/single_thread_task_runner.h"
 #include "media/audio/audio_manager.h"
 #include "media/audio/sounds/audio_stream_handler.h"
 #include "media/base/media_switches.h"
@@ -35,13 +35,14 @@ class SoundsManagerImpl : public SoundsManager {
 
  private:
   base::hash_map<SoundKey, linked_ptr<AudioStreamHandler> > handlers_;
-  scoped_refptr<base::MessageLoopProxy> message_loop_;
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(SoundsManagerImpl);
 };
 
 SoundsManagerImpl::SoundsManagerImpl()
-    : message_loop_(AudioManager::Get()->GetMessageLoop()) {}
+    : task_runner_(AudioManager::Get()->GetTaskRunner()) {
+}
 
 SoundsManagerImpl::~SoundsManagerImpl() { DCHECK(CalledOnValidThread()); }