Revert of [media] Replace MessageLoopProxy usage with ThreadTaskRunnerHandle

media/base/serial_runner.cc

Index: media/base/serial_runner.cc
diff --git a/media/base/serial_runner.cc b/media/base/serial_runner.cc
index 9e5993071e45885b3280c3645e3e63a7160f71df..779566c794100d853533e7aaeeb8d33303bc7135 100644
--- a/media/base/serial_runner.cc
+++ b/media/base/serial_runner.cc
@@ -7,8 +7,8 @@
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/location.h"
+#include "base/message_loop/message_loop_proxy.h"
 #include "base/single_thread_task_runner.h"
-#include "base/thread_task_runner_handle.h"
 
 namespace media {
 
@@ -68,7 +68,7 @@
 
 SerialRunner::SerialRunner(const Queue& bound_fns,
                            const PipelineStatusCB& done_cb)
-    : task_runner_(base::ThreadTaskRunnerHandle::Get()),
+    : task_runner_(base::MessageLoopProxy::current()),
       bound_fns_(bound_fns),
       done_cb_(done_cb),
       weak_factory_(this) {