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

ppapi/tests/test_audio.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 PAPPI_TESTS_TEST_AUDIO_H_
 #define PAPPI_TESTS_TEST_AUDIO_H_
 
 #include <string>
 
+#include "ppapi/c/ppb_audio.h"
+#include "ppapi/c/ppb_audio_config.h"
+#include "ppapi/c/ppb_core.h"
 #include "ppapi/tests/test_case.h"
 
-struct PPB_Audio;
-struct PPB_AudioConfig;
-struct PPB_Core;
-
 class TestAudio : public TestCase {
  public:
   explicit TestAudio(TestingInstance* instance) : TestCase(instance) {}
 
   // TestCase implementation.
   virtual bool Init();
   virtual void RunTests(const std::string& filter);
 
  private:
   std::string TestCreation();
   std::string TestDestroyNoStop();
   std::string TestFailures();
 
   const PPB_Audio* audio_interface_;
   const PPB_AudioConfig* audio_config_interface_;
   const PPB_Core* core_interface_;
 };
 
 #endif  // PAPPI_TESTS_TEST_AUDIO_H_