events: Get rid of GestureStatus in favour of EventResult.

ash/system/tray/tray_notification_view.cc

Index: ash/system/tray/tray_notification_view.cc
diff --git a/ash/system/tray/tray_notification_view.cc b/ash/system/tray/tray_notification_view.cc
index 7536572369ce710f05a3df75d681da4b64872cd2..1943911b7f3f7422b83aee3b437af7b2689e0d1c 100644
--- a/ash/system/tray/tray_notification_view.cc
+++ b/ash/system/tray/tray_notification_view.cc
@@ -120,12 +120,12 @@ bool TrayNotificationView::OnMousePressed(const ui::MouseEvent& event) {
   return true;
 }
 
-ui::GestureStatus TrayNotificationView::OnGestureEvent(
+ui::EventResult TrayNotificationView::OnGestureEvent(
     const ui::GestureEvent& event) {
   if (event.type() != ui::ET_GESTURE_TAP)
-    return ui::GESTURE_STATUS_UNKNOWN;
+    return ui::ER_UNHANDLED;
   HandleClickAction();
-  return ui::GESTURE_STATUS_CONSUMED;
+  return ui::ER_CONSUMED;
 }
 
 void TrayNotificationView::OnClose() {