Move WeakPtrFactory to the end of AsyncHandleWaiter

ipc/mojo/async_handle_waiter.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IPC_MOJO_ASYNC_HANDLE_WAITER_H_
 #define IPC_MOJO_ASYNC_HANDLE_WAITER_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 14 matching lines @@
   class Context;
 
   explicit AsyncHandleWaiter(base::Callback<void(MojoResult)> callback);
   ~AsyncHandleWaiter();
 
   MojoResult Wait(MojoHandle handle, MojoHandleSignals signals);
 
  private:
   void InvokeCallback(MojoResult result);
 
-  base::WeakPtrFactory<AsyncHandleWaiter> weak_factory_;
   scoped_refptr<Context> context_;
   base::Callback<void(MojoResult)> callback_;
+  base::WeakPtrFactory<AsyncHandleWaiter> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AsyncHandleWaiter);
 };
 
 }  // namespace internal
 }  // namespace IPC
 
 #endif  // IPC_MOJO_ASYNC_HANDLE_WAITER_H_