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

ppapi/thunk/ppb_fullscreen_thunk.cc

Index: ppapi/thunk/ppb_fullscreen_thunk.cc
diff --git a/ppapi/thunk/ppb_fullscreen_thunk.cc b/ppapi/thunk/ppb_fullscreen_thunk.cc
index 5f2a0e0fb216ba2b662377eedcb5b498e86d5ab3..0021507db29ce7c157da8c6f2a5dc443493f495f 100644
--- a/ppapi/thunk/ppb_fullscreen_thunk.cc
+++ b/ppapi/thunk/ppb_fullscreen_thunk.cc
@@ -46,7 +46,7 @@ const PPB_Fullscreen g_ppb_fullscreen_thunk = {
 
 }  // namespace
 
-const PPB_Fullscreen* GetPPB_Fullscreen_Thunk() {
+const PPB_Fullscreen_1_0* GetPPB_Fullscreen_1_0_Thunk() {
   return &g_ppb_fullscreen_thunk;
 }