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

ppapi/thunk/ppb_file_chooser_thunk.cc

Index: ppapi/thunk/ppb_file_chooser_thunk.cc
diff --git a/ppapi/thunk/ppb_file_chooser_thunk.cc b/ppapi/thunk/ppb_file_chooser_thunk.cc
index e5cbc5dbbfa92ee4cec4e17a0acf830bdabfa514..037e2b02e92148b72740597a605837dc5b397906 100644
--- a/ppapi/thunk/ppb_file_chooser_thunk.cc
+++ b/ppapi/thunk/ppb_file_chooser_thunk.cc
@@ -78,11 +78,11 @@ const PPB_FileChooserTrusted g_ppb_file_chooser_trusted_thunk = {
 
 }  // namespace
 
-const PPB_FileChooser_Dev* GetPPB_FileChooser_Dev_Thunk() {
+const PPB_FileChooser_Dev_0_5* GetPPB_FileChooser_Dev_0_5_Thunk() {
   return &g_ppb_file_chooser_thunk;
 }
 
-const PPB_FileChooserTrusted* GetPPB_FileChooser_Trusted_Thunk() {
+const PPB_FileChooserTrusted_0_5* GetPPB_FileChooser_Trusted_0_5_Thunk() {
   return &g_ppb_file_chooser_trusted_thunk;
 }