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 4c5626e914a660e195e6ec67bce0ad00175b1bbe..426925b8b980cfa15c437ab45708e3a381e42026 100644
--- a/ppapi/thunk/ppb_fullscreen_thunk.cc
+++ b/ppapi/thunk/ppb_fullscreen_thunk.cc
@@ -42,7 +42,7 @@ 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;
 }