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

ppapi/thunk/ppb_url_loader_thunk.cc

Index: ppapi/thunk/ppb_url_loader_thunk.cc
diff --git a/ppapi/thunk/ppb_url_loader_thunk.cc b/ppapi/thunk/ppb_url_loader_thunk.cc
index 236144f320da66a4ff1ba2e5cf9809ba9d148e17..7c4827eee5c3946fbb3f5485606787c9cbf5de22 100644
--- a/ppapi/thunk/ppb_url_loader_thunk.cc
+++ b/ppapi/thunk/ppb_url_loader_thunk.cc
@@ -139,11 +139,11 @@ const PPB_URLLoaderTrusted g_ppb_urlloader_trusted_thunk = {
 
 }  // namespace
 
-const PPB_URLLoader* GetPPB_URLLoader_Thunk() {
+const PPB_URLLoader_1_0* GetPPB_URLLoader_1_0_Thunk() {
   return &g_ppb_urlloader_thunk;
 }
 
-const PPB_URLLoaderTrusted* GetPPB_URLLoaderTrusted_Thunk() {
+const PPB_URLLoaderTrusted_0_3* GetPPB_URLLoaderTrusted_0_3_Thunk() {
   return &g_ppb_urlloader_trusted_thunk;
 }