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

ppapi/thunk/ppb_file_io_trusted_thunk.cc

Index: ppapi/thunk/ppb_file_io_trusted_thunk.cc
diff --git a/ppapi/thunk/ppb_file_io_trusted_thunk.cc b/ppapi/thunk/ppb_file_io_trusted_thunk.cc
index e1789bdcf1f183039162796e975e2f8b80ddc0f2..7a81749ec7bb3451b822fba0e83d222bd7d907a0 100644
--- a/ppapi/thunk/ppb_file_io_trusted_thunk.cc
+++ b/ppapi/thunk/ppb_file_io_trusted_thunk.cc
@@ -52,7 +52,7 @@ const PPB_FileIOTrusted g_ppb_file_io_trusted_thunk = {
 
 }  // namespace
 
-const PPB_FileIOTrusted* GetPPB_FileIOTrusted_Thunk() {
+const PPB_FileIOTrusted_0_4* GetPPB_FileIOTrusted_0_4_Thunk() {
   return &g_ppb_file_io_trusted_thunk;
 }