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 186267)
+++ content/renderer/renderer_webkitplatformsupport_impl.h	(working copy)
@@ -21,6 +21,7 @@
 namespace content {
 class GamepadSharedMemoryReader;
 class RendererClipboardClient;
+class ThreadSafeSender;
 class WebFileSystemImpl;
 class WebSharedWorkerRepositoryImpl;
 
@@ -154,6 +155,8 @@
   scoped_ptr<WebKit::WebBlobRegistry> blob_registry_;
 
   scoped_ptr<GamepadSharedMemoryReader> gamepad_shared_memory_reader_;
+
+  scoped_refptr<ThreadSafeSender> thread_safe_sender_;
 };
 
 }  // namespace content