Fix mac_views_browser compile after r406360 (MessageLoop::Run() protected on Mac)

chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc

Index: chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc
diff --git a/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc b/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc
index 462a0cdd49b9ae84cc61d61b9d0dc47ba996b933..58224c4876afef243efd467d2374ba3cebdd4d64 100644
--- a/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc
+++ b/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc
@@ -532,7 +532,7 @@ class DetachToBrowserTabDragControllerTest
       // Schedule observer to quit message loop when done dragging. This has to
       // be async so the message loop can run.
       test::QuitWhenNotDraggingImpl();
-      base::MessageLoop::current()->Run();
+      base::RunLoop().Run();
     } else {
       // Touch events are sync, so we know we're not in a drag session. But some
       // tests rely on the browser fully closing, which is async. So, run all