Move RFH's WeakPtrFactory to be the last member.

content/browser/frame_host/render_frame_host_impl.h

 // Copyright 2013 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 CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_
 
 #include <map>
 #include <vector>
 
@@ skipping 461 matching lines @@
   // be one suspended navigation, because RenderFrameHostManager will destroy
   // the pending RenderFrameHost and create a new one if a second navigation
   // occurs.
   scoped_ptr<FrameMsg_Navigate_Params> suspended_nav_params_;
 
   // When the last BeforeUnload message was sent.
   base::TimeTicks send_before_unload_start_time_;
 
   ServiceRegistryImpl service_registry_;
 
-  base::WeakPtrFactory<RenderFrameHostImpl> weak_ptr_factory_;
-
   scoped_ptr<BrowserAccessibilityManager> browser_accessibility_manager_;
 
   // Callback when an event is received, for testing.
   base::Callback<void(ui::AXEvent, int)> accessibility_testing_callback_;
   // The most recently received accessibility tree - for testing only.
   scoped_ptr<ui::AXTree> ax_tree_for_testing_;
 
+  // NOTE: This must be the last member.
+  base::WeakPtrFactory<RenderFrameHostImpl> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_RENDER_FRAME_HOST_IMPL_H_