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

ppapi/thunk/ppb_instance_thunk.cc

Index: ppapi/thunk/ppb_instance_thunk.cc
diff --git a/ppapi/thunk/ppb_instance_thunk.cc b/ppapi/thunk/ppb_instance_thunk.cc
index 07951bcce9c7178e39b7aff5905e56754a69965f..69408c822525c78ebbaf441e8515e4879f5a85ba 100644
--- a/ppapi/thunk/ppb_instance_thunk.cc
+++ b/ppapi/thunk/ppb_instance_thunk.cc
@@ -62,10 +62,10 @@ const PPB_Instance_Private g_ppb_instance_private_thunk = {
 
 }  // namespace
 
-const PPB_Instance* GetPPB_Instance_Thunk() {
+const PPB_Instance_1_0* GetPPB_Instance_1_0_Thunk() {
   return &g_ppb_instance_thunk;
 }
-const PPB_Instance_Private* GetPPB_Instance_Private_Thunk() {
+const PPB_Instance_Private_0_1* GetPPB_Instance_Private_0_1_Thunk() {
   return &g_ppb_instance_private_thunk;
 }