Fix some WeakPtrFactory members that aren't last

ppapi/shared_impl/resource_tracker.h

 // Copyright (c) 2012 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 PPAPI_SHARED_IMPL_RESOURCE_TRACKER_H_
 #define PPAPI_SHARED_IMPL_RESOURCE_TRACKER_H_
 
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 108 matching lines @@
   // behalf of the plugin. When it drops to 0, we free that ref, keeping
   // the resource in the list.
   //
   // A resource will be in this list as long as the object is alive.
   typedef std::pair<Resource*, int> ResourceAndRefCount;
   typedef base::hash_map<PP_Resource, ResourceAndRefCount> ResourceMap;
   ResourceMap live_resources_;
 
   int32 last_resource_value_;
 
-  base::WeakPtrFactory<ResourceTracker> weak_ptr_factory_;
-
   // On the host side, we want to check that we are only called on the main
   // thread. This is to protect us from accidentally using the tracker from
   // other threads (especially the IO thread). On the plugin side, the tracker
   // is protected by the proxy lock and is thread-safe, so this will be NULL.
   scoped_ptr<base::ThreadChecker> thread_checker_;
 
+  base::WeakPtrFactory<ResourceTracker> weak_ptr_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(ResourceTracker);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_RESOURCE_TRACKER_H_