MD Settings: tweak tap and actionable-ness of <settings-toggle-button>

chrome/browser/resources/settings/controls/settings_toggle_button.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-toggle-button` is a toggle that controls a supplied preference.
  */
 Polymer({
   is: 'settings-toggle-button',
 
   behaviors: [SettingsBooleanControlBehavior],
+
+  /** @private */
+  onLabelWrapperTap_: function() {
+    if (!this.controlDisabled_())
+      this.checked = !this.checked;
+  },
 });