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

ppapi/thunk/ppb_file_ref_thunk.cc

Index: ppapi/thunk/ppb_file_ref_thunk.cc
diff --git a/ppapi/thunk/ppb_file_ref_thunk.cc b/ppapi/thunk/ppb_file_ref_thunk.cc
index 5041c55ab26067f7258f82bb4fcca50c50b525a3..d0264ced9d6d89e9c415e1e359e1638eb7d04c45 100644
--- a/ppapi/thunk/ppb_file_ref_thunk.cc
+++ b/ppapi/thunk/ppb_file_ref_thunk.cc
@@ -125,11 +125,11 @@ const PPB_FileRefPrivate g_ppb_file_ref_private_thunk = {
 
 }  // namespace
 
-const PPB_FileRef* GetPPB_FileRef_Thunk() {
+const PPB_FileRef_1_0* GetPPB_FileRef_1_0_Thunk() {
   return &g_ppb_file_ref_thunk;
 }
 
-const PPB_FileRefPrivate* GetPPB_FileRefPrivate_Thunk() {
+const PPB_FileRefPrivate_0_1* GetPPB_FileRefPrivate_0_1_Thunk() {
   return &g_ppb_file_ref_private_thunk;
 }