[MD settings] rename lastRoutChangeWasPopstate var

chrome/browser/resources/settings/settings_page/main_page_behavior.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.
 
 /**
  * Responds to route changes by expanding, collapsing, or scrolling to sections
  * on the page. Expanded sections take up the full height of the container. At
  * most one section should be expanded at any given time.
  * @polymerBehavior MainPageBehavior
  */
 var MainPageBehaviorImpl = {
   properties: {
     /**
      * Help CSS to alter style during the horizontal swipe animation.
      * Note that this is unrelated to the |currentAnimation_| (which refers to
-     * the vertical exapand animation).
+     * the vertical expand animation).
      */
     isSubpageAnimating: {
       reflectToAttribute: true,
       type: Boolean,
     },
 
     /**
      * Whether a search operation is in progress or previous search results are
      * being displayed.
      * @private {boolean}
      */
     inSearchMode: {
       type: Boolean,
       value: false,
       observer: 'inSearchModeChanged_',
     },
   },
 
   /** @type {?HTMLElement} The scrolling container. */
   scroller: null,
 
-  listeners: {
-    'neon-animation-finish': 'onNeonAnimationFinish_'
-  },
+  listeners: {'neon-animation-finish': 'onNeonAnimationFinish_'},
 
   /** @override */
   attached: function() {
     this.scroller = this.domHost ? this.domHost.parentNode : document.body;
   },
 
   /**
    * Remove the is-animating attribute once the animation is complete.
    * This may catch animations finishing more often than needed, which is not
    * known to cause any issues (e.g. when animating from a shallower page to a
@@ skipping 298 matching lines @@
     return /** @type {?SettingsSectionElement} */(
         this.$$('settings-section[section="' + section + '"]'));
   },
 };
 
 /** @polymerBehavior */
 var MainPageBehavior = [
   settings.RouteObserverBehavior,
   MainPageBehaviorImpl,
 ];