Update PPAPI IDL generator to define versioned structs, and unversioned typedef.

ppapi/thunk/ppb_messaging_thunk.cc

 // 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.
 
 #include "ppapi/c/ppb_messaging.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/thunk.h"
 #include "ppapi/thunk/ppb_instance_api.h"
 
 namespace ppapi {
 namespace thunk {
 
 namespace {
 
 void PostMessage(PP_Instance instance, PP_Var message) {
   EnterFunction<PPB_Instance_FunctionAPI> enter(instance, true);
   if (enter.succeeded())
     enter.functions()->PostMessage(instance, message);
 }
 
 const PPB_Messaging g_ppb_messaging_thunk = {
   &PostMessage
 };
 
 }  // namespace
 
-const PPB_Messaging* GetPPB_Messaging_Thunk() {
+const PPB_Messaging_1_0* GetPPB_Messaging_1_0_Thunk() {
   return &g_ppb_messaging_thunk;
 }
 
 }  // namespace thunk
 }  // namespace ppapi