Explicitly coerce PostDispatchAction to uint32_t in DispatchEvent()

ui/display/chromeos/x11/native_display_event_dispatcher_x11.cc

Index: ui/display/chromeos/x11/native_display_event_dispatcher_x11.cc
diff --git a/ui/display/chromeos/x11/native_display_event_dispatcher_x11.cc b/ui/display/chromeos/x11/native_display_event_dispatcher_x11.cc
index f5c2e2e929839f74e27b14e0dfde534c39fddf3b..c30b319dedff6bebeeeea3ef34bce4d0e97fa56f 100644
--- a/ui/display/chromeos/x11/native_display_event_dispatcher_x11.cc
+++ b/ui/display/chromeos/x11/native_display_event_dispatcher_x11.cc
@@ -37,21 +37,21 @@ uint32_t NativeDisplayEventDispatcherX11::DispatchEvent(
   if (event->type - xrandr_event_base_ == RRScreenChangeNotify) {
     VLOG(1) << "Received RRScreenChangeNotify event";
     delegate_->UpdateXRandRConfiguration(event);
-    return ui::POST_DISPATCH_PERFORM_DEFAULT;
+    return ui::kPostDispatchPerformDefault;
   }
 
   // Bail out early for everything except RRNotify_OutputChange events
   // about an output getting connected or disconnected.
   if (event->type - xrandr_event_base_ != RRNotify)
-    return ui::POST_DISPATCH_PERFORM_DEFAULT;
+    return ui::kPostDispatchPerformDefault;
   const XRRNotifyEvent* notify_event = reinterpret_cast<XRRNotifyEvent*>(event);
   if (notify_event->subtype != RRNotify_OutputChange)
-    return ui::POST_DISPATCH_PERFORM_DEFAULT;
+    return ui::kPostDispatchPerformDefault;
   const XRROutputChangeNotifyEvent* output_change_event =
       reinterpret_cast<XRROutputChangeNotifyEvent*>(event);
   const int action = output_change_event->connection;
   if (action != RR_Connected && action != RR_Disconnected)
-    return ui::POST_DISPATCH_PERFORM_DEFAULT;
+    return ui::kPostDispatchPerformDefault;
 
   const bool connected = (action == RR_Connected);
   VLOG(1) << "Received RRNotify_OutputChange event:"
@@ -80,7 +80,7 @@ uint32_t NativeDisplayEventDispatcherX11::DispatchEvent(
         if (connected && x11_output->crtc() == output_change_event->crtc &&
             x11_mode->mode_id() == output_change_event->mode) {
           VLOG(1) << "Ignoring event describing already-cached state";
-          return POST_DISPATCH_PERFORM_DEFAULT;
+          return kPostDispatchPerformDefault;
         }
         found_changed_output = true;
         break;
@@ -89,13 +89,13 @@ uint32_t NativeDisplayEventDispatcherX11::DispatchEvent(
 
     if (!connected && !found_changed_output) {
       VLOG(1) << "Ignoring event describing already-disconnected output";
-      return ui::POST_DISPATCH_PERFORM_DEFAULT;
+      return ui::kPostDispatchPerformDefault;
     }
   }
 
   delegate_->NotifyDisplayObservers();
 
-  return ui::POST_DISPATCH_PERFORM_DEFAULT;
+  return ui::kPostDispatchPerformDefault;
 }
 
 void NativeDisplayEventDispatcherX11::SetTickClockForTest(