MD Settings: Remove tabindex from container after it is blurred.

chrome/browser/resources/settings/settings_ui/settings_ui.js

 // Copyright 2015 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-ui' implements the UI for the Settings page.
  *
  * Example:
  *
@@ skipping 250 matching lines @@
       this.$.drawer.closeDrawer();
   },
 
   /** @private */
   onMenuButtonTap_: function() {
     this.$.drawer.toggle();
   },
 
   /** @private */
   onMenuClosed_: function() {
+    // Add tab index so that the container can be focused.
+    this.$.container.setAttribute('tabindex', '-1');
     this.$.container.focus();
+
+    listenOnce(this.$.container, ['blur', 'pointerdown'], function(e) {

[Dan Beam, 2017/04/08 01:34:16]

nit: don't need |e| any more

[dpapad, 2017/04/08 01:35:36]

Done.

+      this.$.container.removeAttribute('tabindex');
+    }.bind(this));
   },
 
   /** @private */
   directionDelegateChanged_: function() {
     this.$.drawer.align = this.directionDelegate.isRtl() ?
         'right' : 'left';
   },
 });