Reland http://codereview.chromium.org/7292033

ppapi/c/ppb_messaging.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_C_PPB_MESSAGING_H_
 #define PPAPI_C_PPB_MESSAGING_H_
 
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_var.h"
 
 #define PPB_MESSAGING_INTERFACE_0_1 "PPB_Messaging;0.1"
-#define PPB_MESSAGING_INTERFACE PPB_MESSAGING_INTERFACE_0_1
+#define PPB_MESSAGING_INTERFACE_1_0 "PPB_Messaging;1.0"
+#define PPB_MESSAGING_INTERFACE PPB_MESSAGING_INTERFACE_1_0
 
 /**
  * @file
  * This file defines the <code>PPB_Messaging</code> interface implemented
  * by the browser for sending messages to DOM elements associated with a
  * specific module instance.
  *
  * @addtogroup Interfaces
  * @{
  */
@@ skipping 60 matching lines @@
    *
    * The browser will pop-up an alert saying "Hello world!"
    */
   void (*PostMessage)(PP_Instance instance, struct PP_Var message);
 };
 /**
  * @}
  */
 
 #endif  /* PPAPI_C_PPB_MESSAGING_H_ */