MD Settings: update dialogs to focus without ink when using mouse

chrome/browser/resources/settings/printing_page/cups_printers.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview 'settings-cups-printers' is a component for showing CUPS
  * Printer settings subpage (chrome://md-settings/cupsPrinters). It is used to
  * set up legacy & non-CloudPrint printers on ChromeOS by leveraging CUPS (the
  * unix printing system) and the many open source drivers built for CUPS.
  */
@@ skipping 103 matching lines @@
   },
 
   /** @private */
   onAddPrinterTap_: function() {
     this.$.addPrinterDialog.open();
     this.$.addPrinterErrorMessage.hidden = true;
   },
 
   /** @private */
   onAddPrinterDialogClose_: function() {
-    this.$$('#addPrinter').focus();
+    cr.ui.focusWithoutInk(assert(this.$$('#addPrinter')));
   },
 });