Use ThreadSafeSender in a couple of places.

content/renderer/renderer_webkitplatformsupport_impl.h

Index: content/renderer/renderer_webkitplatformsupport_impl.h
===================================================================
--- content/renderer/renderer_webkitplatformsupport_impl.h	(revision 184814)
+++ content/renderer/renderer_webkitplatformsupport_impl.h	(working copy)
@@ -22,6 +22,7 @@
 class GamepadSharedMemoryReader;
 class Hyphenator;
 class RendererClipboardClient;
+class ThreadSafeSender;
 class WebFileSystemImpl;
 class WebSharedWorkerRepositoryImpl;
 
@@ -157,6 +158,8 @@
   scoped_ptr<GamepadSharedMemoryReader> gamepad_shared_memory_reader_;
 
   scoped_ptr<content::Hyphenator> hyphenator_;
+
+  scoped_refptr<ThreadSafeSender> thread_safe_sender_;
 };
 
 }  // namespace content