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

ppapi/thunk/ppb_url_response_info_thunk.cc

Index: ppapi/thunk/ppb_url_response_info_thunk.cc
diff --git a/ppapi/thunk/ppb_url_response_info_thunk.cc b/ppapi/thunk/ppb_url_response_info_thunk.cc
index 3fecb93686efc51c4fca1fbf6209f3a407c6c3ba..3b086149869b8e068b191e9242164bf0269fc56f 100644
--- a/ppapi/thunk/ppb_url_response_info_thunk.cc
+++ b/ppapi/thunk/ppb_url_response_info_thunk.cc
@@ -39,7 +39,7 @@ const PPB_URLResponseInfo g_ppb_url_response_info_thunk = {
 
 }  // namespace
 
-const PPB_URLResponseInfo* GetPPB_URLResponseInfo_Thunk() {
+const PPB_URLResponseInfo_1_0* GetPPB_URLResponseInfo_1_0_Thunk() {
   return &g_ppb_url_response_info_thunk;
 }