PPAPI: Make PPP_MessageHandler work in PNaCl

ppapi/api/ppb_messaging.idl

 /* 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.
  */
 
 /**
  * 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.
  */
 
-[generate_thunk]
-
 label Chrome {
   M14 = 1.0,
-  [channel=dev] M37 = 1.1
+  [channel=dev] M39 = 1.2
 };
 
 /**
  * The <code>PPB_Messaging</code> interface is implemented by the browser
  * and is related to sending messages to JavaScript message event listeners on
  * the DOM element associated with specific module instance.
  */
 interface PPB_Messaging {
   /**
    * PostMessage() asynchronously invokes any listeners for message events on
@@ skipping 86 matching lines @@
    * of a module.
    * @param[in] user_data A pointer the plugin may choose to use when handling
    * calls to functions within PPP_MessageHandler. The browser will pass this
    * same pointer when invoking functions within PPP_MessageHandler.
    * @param[in] handler The plugin-provided set of functions for handling
    * messages.
    * @param[in] message_loop Represents the message loop on which
    * PPP_MessageHandler functions should be invoked.
    * @return PP_OK on success, or an error from pp_errors.h.
    */
-  [version=1.1]
+  [version=1.2]
   int32_t RegisterMessageHandler([in] PP_Instance instance,
                                  [inout] mem_t user_data,
                                  [in] PPP_MessageHandler handler,
                                  [in] PP_Resource message_loop);
   /**
    * Unregisters the current message handler for <code>instance</code> if one
    * is registered. After this call, the message handler (if one was
    * registered) will have "Destroy" called on it and will receive no further
    * messages after that point. After that point, all messages sent from
    * JavaScript using postMessage() will be dispatched to PPP_Messaging (if
    * the plugin supports PPP_MESSAGING_INTERFACE). Attempts to call
    * postMessageAndAwaitResponse() from JavaScript will fail.
    *
    * Attempting to unregister a message handler when none is registered has no
    * effect.
    *
    * @param[in] instance A <code>PP_Instance</code> identifying one instance
    * of a module.
    */
-  [version=1.1]
+  [version=1.2]
   void UnregisterMessageHandler([in] PP_Instance instance);
 };