Move WeakPtrFactory to the end of AsyncHandleWaiter

ipc/mojo/async_handle_waiter.cc

 // 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.
 
 #include "ipc/mojo/async_handle_waiter.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 33 matching lines @@
   // A weak reference. Note that |waiter_| must be touched only from the
   // original thread.
   const base::WeakPtr<AsyncHandleWaiter> waiter_;
   const scoped_refptr<base::TaskRunner> runner_;
   MojoResult last_result_;
 
   DISALLOW_COPY_AND_ASSIGN(Context);
 };
 
 AsyncHandleWaiter::AsyncHandleWaiter(base::Callback<void(MojoResult)> callback)
-    : weak_factory_(this),
-      context_(new Context(base::MessageLoop::current()->task_runner(),
-                           weak_factory_.GetWeakPtr())),
-      callback_(callback) {
+    : callback_(callback),
+      weak_factory_(this) {
+  context_ = new Context(base::MessageLoop::current()->task_runner(),
+                         weak_factory_.GetWeakPtr());
 }
 
 AsyncHandleWaiter::~AsyncHandleWaiter() {
 }
 
 MojoResult AsyncHandleWaiter::Wait(MojoHandle handle,
                                    MojoHandleSignals signals) {
   return mojo::embedder::AsyncWait(
       handle, signals, base::Bind(&Context::HandleIsReady, context_));
 }
 
 void AsyncHandleWaiter::InvokeCallback(MojoResult result) {
   callback_.Run(result);
 }
 
 }  // namespace internal
 }  // namespace IPC