Make some updates to extension iconography.

chrome/browser/resources/ntp4/page_list_view.js

 // Copyright (c) 2012 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 PageListView implementation.
  * PageListView manages page list, dot list, switcher buttons and handles apps
  * pages callbacks from backend.
  *
  * Note that you need to have AppLauncherHandler in your WebUI to use this code.
  */
 
 /**
  * @typedef {{app_launch_ordinal: string,
  *            description: string,
  *            detailsUrl: string,
  *            direction: string,
  *            enabled: boolean,
  *            full_name: string,
  *            full_name_direction: string,
  *            homepageUrl: string,
- *            icon_big: string,
- *            icon_big_exists: boolean,
+ *            icon: string,
  *            icon_small: string,
  *            icon_small_exists: boolean,
  *            id: string,
  *            is_component: boolean,
  *            is_webstore: boolean,
  *            kioskEnabled: boolean,
  *            kioskMode: boolean,
  *            kioskOnly: boolean,
  *            launch_container: number,
  *            launch_type: number,
@@ skipping 732 matching lines @@
       if (page.navigationDot)
         page.navigationDot.remove(opt_animate);
       this.cardSlider.removeCard(page);
     },
   };
 
   return {
     PageListView: PageListView
   };
 });