ResourceDispatcher: put WeakPtrFactory last

content/child/resource_dispatcher.h

Index: content/child/resource_dispatcher.h
diff --git a/content/child/resource_dispatcher.h b/content/child/resource_dispatcher.h
index 3aa69beffcc5b1b51e5cb482f66634f87260c082..9df2d868a956157e3efa88f4091086dc61729002 100644
--- a/content/child/resource_dispatcher.h
+++ b/content/child/resource_dispatcher.h
@@ -223,10 +223,10 @@ class CONTENT_EXPORT ResourceDispatcher : public IPC::Listener {
   // IO thread timestamp for ongoing IPC message.
   base::TimeTicks io_timestamp_;
 
-  base::WeakPtrFactory<ResourceDispatcher> weak_factory_;
-
   scoped_refptr<base::SingleThreadTaskRunner> main_thread_task_runner_;
 
+  base::WeakPtrFactory<ResourceDispatcher> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcher);
 };