Make ChildThread::current() and ChildProcess::current() only work on the main thread of the child...

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
===================================================================
--- content/renderer/render_thread_impl.h	(revision 208577)
+++ content/renderer/render_thread_impl.h	(working copy)
@@ -155,9 +155,6 @@
   virtual void ReleaseCachedFonts() OVERRIDE;
 #endif
 
-  // ChildThread:
-  virtual bool IsWebFrameValid(WebKit::WebFrame* frame) OVERRIDE;
-
   // GpuChannelHostFactory implementation:
   virtual bool IsMainThread() OVERRIDE;
   virtual base::MessageLoop* GetMainLoop() OVERRIDE;
@@ -430,6 +427,11 @@
   // The channel from the renderer process to the GPU process.
   scoped_refptr<GpuChannelHost> gpu_channel_;
 
+  // Cache of variables that are needed on the compositor thread by
+  // GpuChannelHostFactory methods.
+  scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
+  base::WaitableEvent* shutdown_event_;
+
   // A lazily initiated thread on which file operations are run.
   scoped_ptr<base::Thread> file_thread_;