Use ThreadSafeSender in a couple of places.

content/worker/worker_webkitplatformsupport_impl.h

Index: content/worker/worker_webkitplatformsupport_impl.h
===================================================================
--- content/worker/worker_webkitplatformsupport_impl.h	(revision 184814)
+++ content/worker/worker_webkitplatformsupport_impl.h	(working copy)
@@ -15,6 +15,7 @@
 }
 
 namespace content {
+class ThreadSafeSender;
 class WebFileSystemImpl;
 
 class WorkerWebKitPlatformSupportImpl : public WebKitPlatformSupportImpl,
@@ -91,11 +92,10 @@
 
   class FileUtilities;
   scoped_ptr<FileUtilities> file_utilities_;
-
   scoped_ptr<WebKit::WebBlobRegistry> blob_registry_;
-
   scoped_ptr<WebFileSystemImpl> web_file_system_;
   scoped_ptr<WebKit::WebIDBFactory> web_idb_factory_;
+  scoped_refptr<ThreadSafeSender> thread_safe_sender_;
 };
 
 }  // namespace content