MD Downloads: fix the compiled_resources2.gyp compile

chrome/browser/resources/md_downloads/manager.js

Index: chrome/browser/resources/md_downloads/manager.js
diff --git a/chrome/browser/resources/md_downloads/manager.js b/chrome/browser/resources/md_downloads/manager.js
index e0bb5f94e66eb03e757a124d9bfbb03d8e310f7a..4700cff65a9dc23dbca583361ca47aefa420a613 100644
--- a/chrome/browser/resources/md_downloads/manager.js
+++ b/chrome/browser/resources/md_downloads/manager.js
@@ -149,7 +149,8 @@ cr.define('downloads', function() {
     updateItem_: function(index, data) {
       this.set('items_.' + index, data);
       this.updateHideDates_(index, index);
-      this.$['downloads-list'].updateSizeForItem(index);
+      var list = /** @type {!IronListElement} */(this.$['downloads-list']);
+      list.updateSizeForItem(index);
     },
   });