Convert app_launch_index and page_index from int to StringOrdinal.

chrome/browser/resources/ntp4/page_list_view.js

Index: chrome/browser/resources/ntp4/page_list_view.js
diff --git a/chrome/browser/resources/ntp4/page_list_view.js b/chrome/browser/resources/ntp4/page_list_view.js
index 7db35c0ba4dfa096f5d0e4480b76a0c36247543d..72579ddfc2c27105273687714c1fcb27910ec7ed 100644
--- a/chrome/browser/resources/ntp4/page_list_view.js
+++ b/chrome/browser/resources/ntp4/page_list_view.js
@@ -293,9 +293,9 @@ cr.define('ntp4', function() {
         return true;
       }
 
-      // Sort by launch index
+      // Sort by launch ordinal
       apps.sort(function(a, b) {
-        return a.app_launch_index - b.app_launch_index;
+        return a.app_launch_ordinal > b.app_launch_ordinal;
       });
 
       // An app to animate (in case it was just installed).