[chrome/renderer/media] Replace MessageLoopProxy usage with ThreadTaskRunnerHandle

chrome/renderer/media/cast_session_delegate.h

Index: chrome/renderer/media/cast_session_delegate.h
diff --git a/chrome/renderer/media/cast_session_delegate.h b/chrome/renderer/media/cast_session_delegate.h
index a2e688c8a7633160c92346f46827947d2fb8be40..963a5905673ab0156048eb39efff995166d00e1d 100644
--- a/chrome/renderer/media/cast_session_delegate.h
+++ b/chrome/renderer/media/cast_session_delegate.h
@@ -12,6 +12,7 @@
 #include "base/memory/linked_ptr.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
+#include "base/single_thread_task_runner.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_checker.h"
 #include "base/time/default_tick_clock.h"
@@ -22,7 +23,6 @@
 namespace base {
 class BinaryValue;
 class DictionaryValue;
-class MessageLoopProxy;
 }  // namespace base
 
 namespace media {
@@ -71,7 +71,7 @@ class CastSessionDelegateBase {
   scoped_ptr<media::cast::CastTransportSender> cast_transport_;
 
   // Proxy to the IO message loop.
-  const scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
+  const scoped_refptr<base::SingleThreadTaskRunner> io_message_loop_proxy_;
   base::WeakPtrFactory<CastSessionDelegateBase> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CastSessionDelegateBase);