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

ppapi/thunk/ppb_image_data_trusted_thunk.cc

Index: ppapi/thunk/ppb_image_data_trusted_thunk.cc
diff --git a/ppapi/thunk/ppb_image_data_trusted_thunk.cc b/ppapi/thunk/ppb_image_data_trusted_thunk.cc
index db53aa2acac7f85da022c7584505b7d7c518d7a4..8a9c7db2e937c4d93d4c993c7a9b94facc89cd90 100644
--- a/ppapi/thunk/ppb_image_data_trusted_thunk.cc
+++ b/ppapi/thunk/ppb_image_data_trusted_thunk.cc
@@ -28,7 +28,7 @@ const PPB_ImageDataTrusted g_ppb_image_data_trusted_thunk = {
 
 }  // namespace
 
-const PPB_ImageDataTrusted* GetPPB_ImageDataTrusted_Thunk() {
+const PPB_ImageDataTrusted_0_4* GetPPB_ImageDataTrusted_0_4_Thunk() {
   return &g_ppb_image_data_trusted_thunk;
 }