Fixed invalid parameter used by most visited thumbnail.

chrome/browser/resources/local_ntp/most_visited_thumbnail.js

 // Copyright 2013 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 Rendering for iframed most visited thumbnails.
  */
 
 window.addEventListener('DOMContentLoaded', function() {
@@ skipping 60 matching lines @@
       image.src = src;
     }
 
     var useIcons = params['icons'] == '1';
     if (data.dummy) {
       showEmptyTile();
       logEvent(NTP_LOGGING_EVENT_TYPE.NTP_EXTERNAL_TILE);
     } else if (useIcons && data.largeIconUrl) {
       createThumbnail(data.largeIconUrl, 'large-icon');
       // TODO(huangs): Log event for large icons.
-    } else if (!useIcons && data.thumbnailUrl) {
-      createThumbnail(data.thumbnailUrl, 'thumbnail');
+    } else if (!useIcons && data.thumbnailUrls && data.thumbnailUrls.length) {
+      createThumbnail(data.thumbnailUrls[0], 'thumbnail');
       logEvent(NTP_LOGGING_EVENT_TYPE.NTP_THUMBNAIL_TILE);
     } else if (data.domain) {
       showDomainElement();
       logEvent(NTP_LOGGING_EVENT_TYPE.NTP_GRAY_TILE);
     } else {
       showEmptyTile();
       logEvent(NTP_LOGGING_EVENT_TYPE.NTP_EXTERNAL_TILE);
     }
     logEvent(NTP_LOGGING_EVENT_TYPE.NTP_TILE);
 
     // Log an impression if we know the position of the tile.
     if (isFinite(params.pos) && data.provider) {
       logMostVisitedImpression(parseInt(params.pos, 10), data.provider);
     }
   });
 });