Inherit current window's node-integration in window.open by default

Fix #2100.

atom/renderer/lib/override.coffee

@@ -51,6 +51,12 @@ window.open = (url, frameName='', features='') ->
 
   (options[name] = parseInt(options[name], 10) if options[name]?) for name in ints
 
+  # Inherit the node-integration option of current window.
+  unless options['node-integration']
+    for arg in process.argv when arg.indexOf('--node-integration=') is 0
+      options['node-integration'] = arg.substr(-4) is 'true'
+      break
+
   guestId = ipc.sendSync 'ATOM_SHELL_GUEST_WINDOW_MANAGER_WINDOW_OPEN', url, frameName, options
   if guestId
     new BrowserWindowProxy(guestId)