[Sync] Add type conversion constructor for WeakHandle

chrome/browser/ui/webui/sync_internals_ui.cc

Index: chrome/browser/ui/webui/sync_internals_ui.cc
diff --git a/chrome/browser/ui/webui/sync_internals_ui.cc b/chrome/browser/ui/webui/sync_internals_ui.cc
index bcfd89b39dbbe7a28b3a7b83abecf32d5855ac26..8b03d283e80b1f4dbc593825cb963adfbc26de88 100644
--- a/chrome/browser/ui/webui/sync_internals_ui.cc
+++ b/chrome/browser/ui/webui/sync_internals_ui.cc
@@ -113,7 +113,7 @@ void SyncInternalsUI::OnWebUISend(const GURL& source_url,
     if (js_controller_.get()) {
       js_controller_->ProcessJsMessage(
           name, args,
-          WeakHandle<JsReplyHandler>(weak_ptr_factory_.GetWeakPtr()));
+          MakeWeakHandle(weak_ptr_factory_.GetWeakPtr()));
     } else {
       LOG(WARNING) << "No sync service; dropping message " << name
                    << " with args " << args.ToString();