Explicitly coerce PostDispatchAction to uint32_t in DispatchEvent()

ui/views/test/x11_property_change_waiter.cc

Index: ui/views/test/x11_property_change_waiter.cc
diff --git a/ui/views/test/x11_property_change_waiter.cc b/ui/views/test/x11_property_change_waiter.cc
index cdfd31dd6a4fb4c6a990f38350751c1f4f55d7d8..8ac073418391b506b12f4c99b5c2a3d3b1210b4e 100644
--- a/ui/views/test/x11_property_change_waiter.cc
+++ b/ui/views/test/x11_property_change_waiter.cc
@@ -72,13 +72,13 @@ uint32_t X11PropertyChangeWaiter::DispatchEvent(
       event->xproperty.window != x_window_ ||
       event->xproperty.atom != atom_cache_->GetAtom(property_) ||
       ShouldKeepOnWaiting(event)) {
-    return ui::POST_DISPATCH_PERFORM_DEFAULT;
+    return ui::kPostDispatchPerformDefault;
   }
 
   wait_ = false;
   if (!quit_closure_.is_null())
     quit_closure_.Run();
-  return ui::POST_DISPATCH_PERFORM_DEFAULT;
+  return ui::kPostDispatchPerformDefault;
 }
 
 }  // namespace views