Remove the old type system for proxied resources. These were no longer being used.

ppapi/thunk/ppb_pdf_api.h

Index: ppapi/thunk/ppb_pdf_api.h
diff --git a/ppapi/thunk/ppb_pdf_api.h b/ppapi/thunk/ppb_pdf_api.h
index 9f102d5ec4796d0897682e75eb28bbac8e04e91f..b8869295ccb7d671fb3ccc2c60d2acaa49d2e7ef 100644
--- a/ppapi/thunk/ppb_pdf_api.h
+++ b/ppapi/thunk/ppb_pdf_api.h
@@ -11,14 +11,9 @@ namespace ppapi {
 namespace thunk {
 
 class PPB_PDFFont_API {
- private:
+ public:
   virtual ~PPB_PDFFont_API() {}
-
-  virtual bool GetFontTableForPrivateFontFile(PP_Resource font_file,
-                                              uint32_t table,
-                                              void* output,
-                                              uint32_t* output_length) = 0;
-}
+};
 
 }  // namespace thunk
 }  // namespace ppapi