Bring the close timeout back to 5s.

atom/browser/native_window.cc

@@ -313,11 +313,11 @@ void NativeWindow::CloseWebContents() {
   }
 
   // Assume the window is not responding if it doesn't cancel the close and is
-  // not closed in 10s, in this way we can quickly show the unresponsive
+  // not closed in 5s, in this way we can quickly show the unresponsive
   // dialog when the window is busy executing some script withouth waiting for
   // the unresponsive timeout.
   if (window_unresposive_closure_.IsCancelled())
-    ScheduleUnresponsiveEvent(10000);
+    ScheduleUnresponsiveEvent(5000);
 
   if (web_contents->NeedToFireBeforeUnload())
     web_contents->GetRenderViewHost()->FirePageBeforeUnload(false);