Remove calls to deprecated MessageLoop methods in media.

media/cast/test/receiver.cc

Index: media/cast/test/receiver.cc
diff --git a/media/cast/test/receiver.cc b/media/cast/test/receiver.cc
index b2e59bd20d8afd6ee4ccd15f69012c08a451e2a3..0f5fd4e45dc93f526c6ec963c3af3910f599f723 100644
--- a/media/cast/test/receiver.cc
+++ b/media/cast/test/receiver.cc
@@ -21,6 +21,7 @@
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "base/synchronization/lock.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/threading/thread.h"
@@ -602,7 +603,7 @@ int main(int argc, char** argv) {
                                   window_height);
   player.Start();
 
-  message_loop.Run();  // Run forever (i.e., until SIGTERM).
+  base::RunLoop().Run();  // Run forever (i.e., until SIGTERM).
   NOTREACHED();
   return 0;
 }