Bug 1133391 - Remove unused variables in TabParent::RecvDispatchAfterKeyboardEvent. r=smaug.

dom/ipc/TabParent.cpp

@@ -1896,7 +1896,6 @@ TabParent::RecvDispatchAfterKeyboardEvent(const WidgetKeyboardEvent& aEvent)
   if (mFrameElement &&
       PresShell::BeforeAfterKeyboardEventEnabled() &&
       localEvent.message != NS_KEY_PRESS) {
-    nsCOMPtr<nsINode> node(do_QueryInterface(mFrameElement));
     presShell->DispatchAfterKeyboardEvent(mFrameElement, localEvent,
                                           aEvent.mFlags.mDefaultPrevented);
   }