Replace base::File wrapping with typemapping.

components/font_service/public/cpp/font_service_thread.h

Index: components/font_service/public/cpp/font_service_thread.h
diff --git a/components/font_service/public/cpp/font_service_thread.h b/components/font_service/public/cpp/font_service_thread.h
index 9f698f836c0dc812acf040c6029d7a79cdf19fe8..6cfc8622b1a7f079d1e63a60c941053129f06109 100644
--- a/components/font_service/public/cpp/font_service_thread.h
+++ b/components/font_service/public/cpp/font_service_thread.h
@@ -80,7 +80,7 @@ class FontServiceThread : public base::Thread,
                       const uint32_t id_number);
   void OnOpenStreamComplete(base::WaitableEvent* done_event,
                             base::File* output_file,
-                            mojo::ScopedHandle handle);
+                            base::File file);
 
   // Connection to |font_service_| has gone away. Called on the background
   // thread.