[media] Replace MessageLoopProxy usage with ThreadTaskRunnerHandle

media/cast/test/utility/udp_proxy_main.cc

Index: media/cast/test/utility/udp_proxy_main.cc
diff --git a/media/cast/test/utility/udp_proxy_main.cc b/media/cast/test/utility/udp_proxy_main.cc
index d050ea0e116d404cfe219c3cb3804476f7ba4502..439b079747786ca9e6d42be3f60e8875dfc0363f 100644
--- a/media/cast/test/utility/udp_proxy_main.cc
+++ b/media/cast/test/utility/udp_proxy_main.cc
@@ -13,6 +13,8 @@
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
+#include "base/single_thread_task_runner.h"
+#include "base/thread_task_runner_handle.h"
 #include "media/cast/test/utility/udp_proxy.h"
 
 class ByteCounter {
@@ -115,7 +117,7 @@ void CheckByteCounters() {
 
     g_counter.Get().last_printout = now;
   }
-  base::MessageLoopProxy::current()->PostDelayedTask(
+  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
       FROM_HERE,
       base::Bind(&CheckByteCounters),
       base::TimeDelta::FromMilliseconds(100));