[MD Bookmarks] Convert bookmark list to iron-list.

chrome/browser/resources/md_bookmarks/dnd_manager.js

Index: chrome/browser/resources/md_bookmarks/dnd_manager.js
diff --git a/chrome/browser/resources/md_bookmarks/dnd_manager.js b/chrome/browser/resources/md_bookmarks/dnd_manager.js
index f1b0b7b47429cba2c5819fc5402069a4caa4ae7f..0049ca02b88cb2b58e0d6bffafd9098bbd8382d0 100644
--- a/chrome/browser/resources/md_bookmarks/dnd_manager.js
+++ b/chrome/browser/resources/md_bookmarks/dnd_manager.js
@@ -586,10 +586,6 @@ cr.define('bookmarks', function() {
 
       var nextElement = overElement.nextElementSibling;
 
-      // The template element sits past the end of the last bookmark element.
-      if (!isBookmarkItem(nextElement) && !isBookmarkFolderNode(nextElement))
-        nextElement = null;
-
       // Cannot drop below if the item below is already in the drag source.
       if (!nextElement || !dragInfo.isDraggingBookmark(nextElement.itemId))
         validDropPositions |= DropPosition.BELOW;