servo: Merge #1863 - Use Option::or_else in eventdispatcher::dispatch_event (from saneyuki:1841); r=metajack

fix #1841

Source-Repo: https://github.com/servo/servo
Source-Revision: 4b061dc43d5a0d0f9850e0512eed28bfb8476e7b

servo/src/components/script/dom/eventdispatcher.rs

@@ -17,10 +17,9 @@ pub fn dispatch_event(target: &JS<EventTarget>,
 
     {
         let event = event.get_mut();
-        event.target = match pseudo_target {
-            Some(pseudo_target) => Some(pseudo_target),
-            None => Some(target.clone())
-        };
+        event.target = pseudo_target.or_else(|| {
+            Some(target.clone())
+        });
         event.dispatching = true;
     }