Remove all remaining traces of MessageLoopProxy.

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 477c555c756ee78cc2c418420529fe9d5e5bbcd0..9a3795f2ddc0d1d801081766f2b817cad35cf6f6 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -171,7 +171,7 @@ class CONTENT_EXPORT RenderThreadImpl
   IPC::SyncChannel* GetChannel() override;
   std::string GetLocale() override;
   IPC::SyncMessageFilter* GetSyncMessageFilter() override;
-  scoped_refptr<base::SingleThreadTaskRunner> GetIOMessageLoopProxy() override;
+  scoped_refptr<base::SingleThreadTaskRunner> GetIOTaskRunner() override;
   void AddRoute(int32_t routing_id, IPC::Listener* listener) override;
   void RemoveRoute(int32_t routing_id) override;
   int GenerateRoutingID() override;
@@ -333,7 +333,7 @@ class CONTENT_EXPORT RenderThreadImpl
   // Returns a SingleThreadTaskRunner instance corresponding to the message loop
   // of the thread on which file operations should be run. Must be called
   // on the renderer's main thread.
-  scoped_refptr<base::SingleThreadTaskRunner> GetFileThreadMessageLoopProxy();
+  scoped_refptr<base::SingleThreadTaskRunner> GetFileThreadTaskRunner();
 
   // Returns a SingleThreadTaskRunner instance corresponding to the message loop
   // of the thread on which media operations should be run. Must be called