MD Settings: Restore focus when channel switcher dialog is closed.

chrome/browser/resources/settings/about_page/detailed_build_info.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-detailed-build-info' contains detailed build
  * information for ChromeOS.
  */
 
 Polymer({
@@ skipping 71 matching lines @@
         CrPolicyIndicatorType.OWNER;
   },
 
   /**
    * @param {!Event} e
    * @private
    */
   onChangeChannelTap_: function(e) {
     e.preventDefault();
     this.showChannelSwitcherDialog_ = true;
-    // Async to wait for dialog to appear in the DOM.
-    this.async(function() {
-      var dialog = this.$$('settings-channel-switcher-dialog');
-      // Register listener to detect when the dialog is closed. Flip the boolean
-      // once closed to force a restamp next time it is shown such that the
-      // previous dialog's contents are cleared.
-      dialog.addEventListener('close', function() {
-        this.showChannelSwitcherDialog_ = false;
-        this.updateChannelInfo_();
-      }.bind(this));
-    }.bind(this));
+  },
+
+  /** @private */
+  onChannelSwitcherDialogClosed_: function() {
+    this.showChannelSwitcherDialog_ = false;
+    this.$$('paper-button').focus();
+    this.updateChannelInfo_();

[stevenjb, 2017/04/06 23:08:06]

Ahh, much nicer :) Cheers!

   },
 });