Revert "content: Remove use of MessageLoopProxy and deprecated MessageLoop APIs"

content/public/test/mock_render_thread.cc

Index: content/public/test/mock_render_thread.cc
diff --git a/content/public/test/mock_render_thread.cc b/content/public/test/mock_render_thread.cc
index 60f19f0599ca4ce8d6b66730bef2a56564272f76..9d3c51bb290cd546b1a8f1ff13911649ce32b947 100644
--- a/content/public/test/mock_render_thread.cc
+++ b/content/public/test/mock_render_thread.cc
@@ -4,8 +4,7 @@
 
 #include "content/public/test/mock_render_thread.h"
 
-#include "base/single_thread_task_runner.h"
-#include "base/thread_task_runner_handle.h"
+#include "base/message_loop/message_loop_proxy.h"
 #include "content/common/frame_messages.h"
 #include "content/common/view_messages.h"
 #include "content/public/renderer/render_process_observer.h"
@@ -64,7 +63,7 @@ bool MockRenderThread::Send(IPC::Message* msg) {
 }
 
 scoped_refptr<base::SingleThreadTaskRunner> MockRenderThread::GetTaskRunner() {
-  return base::ThreadTaskRunnerHandle::Get();
+  return base::MessageLoopProxy::current();
 }
 
 IPC::SyncChannel* MockRenderThread::GetChannel() {