Fix some WeakPtrFactory members that aren't last

ppapi/proxy/ppb_var_deprecated_proxy.h

 // Copyright (c) 2011 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_PROXY_PPB_VAR_DEPRECATED_PROXY_H_
 #define PPAPI_PROXY_PPB_VAR_DEPRECATED_PROXY_H_
 
 #include <vector>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 71 matching lines @@
                                    PP_Bool* result);
   void OnMsgCreateObjectDeprecated(PP_Instance instance,
                                    int64 ppp_class,
                                    int64 ppp_class_data,
                                    SerializedVarReturnValue result);
 
   // Call in the host for messages that can be reentered.
   void SetAllowPluginReentrancy();
 
   void DoReleaseObject(int64 object_id);
-  base::WeakPtrFactory<PPB_Var_Deprecated_Proxy> task_factory_;
 
   const PPB_Var_Deprecated* ppb_var_impl_;
 
+  base::WeakPtrFactory<PPB_Var_Deprecated_Proxy> task_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(PPB_Var_Deprecated_Proxy);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PPB_VAR_DEPRECATED_PROXY_H_