Fixed invalid parameter used by most visited thumbnail.

chrome/browser/resources/local_ntp/most_visited_thumbnail.js

Index: chrome/browser/resources/local_ntp/most_visited_thumbnail.js
diff --git a/chrome/browser/resources/local_ntp/most_visited_thumbnail.js b/chrome/browser/resources/local_ntp/most_visited_thumbnail.js
index 3bdfd612e368626717a864b35b6d3be6b4ec1354..33baada73dabe51b3cea73dbf1f67d492a4de9b4 100644
--- a/chrome/browser/resources/local_ntp/most_visited_thumbnail.js
+++ b/chrome/browser/resources/local_ntp/most_visited_thumbnail.js
@@ -78,8 +78,8 @@ window.addEventListener('DOMContentLoaded', function() {
     } 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();