Explicitly coerce PostDispatchAction to uint32_t in DispatchEvent()

ui/ozone/platform/caca/caca_window.cc

Index: ui/ozone/platform/caca/caca_window.cc
diff --git a/ui/ozone/platform/caca/caca_window.cc b/ui/ozone/platform/caca/caca_window.cc
index ff2f5716e34bd1b9778cebcb54b894816c7c19e2..d3b486bfd208cb4a94914fba8aeabf50ed1d8c9e 100644
--- a/ui/ozone/platform/caca/caca_window.cc
+++ b/ui/ozone/platform/caca/caca_window.cc
@@ -140,7 +140,7 @@ bool CacaWindow::CanDispatchEvent(const PlatformEvent& event) { return true; }
 uint32_t CacaWindow::DispatchEvent(const PlatformEvent& ne) {
   // We don't dispatch events via PlatformEventSource.
   NOTREACHED();
-  return ui::POST_DISPATCH_STOP_PROPAGATION;
+  return ui::kPostDispatchStopPropagation;
 }
 
 }  // namespace ui