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

ppapi/thunk/ppb_audio_input_thunk.cc

Index: ppapi/thunk/ppb_audio_input_thunk.cc
diff --git a/ppapi/thunk/ppb_audio_input_thunk.cc b/ppapi/thunk/ppb_audio_input_thunk.cc
index 7b6f31c012672dbf5448b142b591a4e00f2bcca8..3d40c1173b90b3a593f415a5c3c4627493b9ded8 100644
--- a/ppapi/thunk/ppb_audio_input_thunk.cc
+++ b/ppapi/thunk/ppb_audio_input_thunk.cc
@@ -66,7 +66,7 @@ const PPB_AudioInput_Dev g_ppb_audioinput_thunk = {
 
 }  // namespace
 
-const PPB_AudioInput_Dev* GetPPB_AudioInput_Dev_Thunk() {
+const PPB_AudioInput_Dev_0_1* GetPPB_AudioInput_Dev_0_1_Thunk() {
   return &g_ppb_audioinput_thunk;
 }