Revert of content/common: Remove use of MessageLoopProxy and deprecated MessageLoop APIs

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index a1864bff97ede4597822df36ea634205610b9827..b0476c92140e9cef78a94e2b842f5ec1e16ea23b 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -1469,9 +1469,8 @@
   return !!current();
 }
 
-scoped_refptr<base::SingleThreadTaskRunner>
-RenderThreadImpl::GetIOThreadTaskRunner() {
-  return io_thread_task_runner_;
+scoped_refptr<base::MessageLoopProxy> RenderThreadImpl::GetIOLoopProxy() {
+  return io_message_loop_proxy_;
 }
 
 scoped_ptr<base::SharedMemory> RenderThreadImpl::AllocateSharedMemory(
@@ -1615,7 +1614,7 @@
 
   // Cache some variables that are needed on the compositor thread for our
   // implementation of GpuChannelHostFactory.
-  io_thread_task_runner_ = ChildProcess::current()->io_message_loop_proxy();
+  io_message_loop_proxy_ = ChildProcess::current()->io_message_loop_proxy();
 
   gpu_channel_ =
       GpuChannelHost::Create(this,