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

ppapi/thunk/ppb_file_system_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/pp_completion_callback.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/ppb_file_system.h"
 #include "ppapi/thunk/common.h"
 #include "ppapi/thunk/enter.h"
 #include "ppapi/thunk/thunk.h"
@@ skipping 36 matching lines @@
 
 const PPB_FileSystem g_ppb_file_system_thunk = {
   &Create,
   &IsFileSystem,
   &Open,
   &GetType
 };
 
 }  // namespace
 
-const PPB_FileSystem* GetPPB_FileSystem_Thunk() {
+const PPB_FileSystem_1_0* GetPPB_FileSystem_1_0_Thunk() {
   return &g_ppb_file_system_thunk;
 }
 
 }  // namespace thunk
 }  // namespace ppapi