Bug 1297048 - remove useless null check in DragEvent::InitDragEvent. r=masayuki

MozReview-Commit-ID: 5BFD0aAyPqq

--HG--
extra : rebase_source : 002756bf045c33bf7f58fafb11c23eeef4550257

dom/events/DragEvent.cpp

@@ -59,7 +59,7 @@ DragEvent::InitDragEvent(const nsAString& aType,
                              aView, aDetail, aScreenX, aScreenY,
                              aClientX, aClientY, aCtrlKey, aAltKey,
                              aShiftKey, aMetaKey, aButton, aRelatedTarget);
-  if (mEventIsInternal && mEvent) {
+  if (mEventIsInternal) {
     mEvent->AsDragEvent()->mDataTransfer = aDataTransfer;
   }
 }