[MD Bookmarks] Add draggable sidebar.

chrome/browser/resources/md_bookmarks/folder_node.js

Index: chrome/browser/resources/md_bookmarks/folder_node.js
diff --git a/chrome/browser/resources/md_bookmarks/folder_node.js b/chrome/browser/resources/md_bookmarks/folder_node.js
index fa56941e113fad610567ecee8d5340748db7d51e..2e1659d0687d15e71c3b206ef737b76b79ee237f 100644
--- a/chrome/browser/resources/md_bookmarks/folder_node.js
+++ b/chrome/browser/resources/md_bookmarks/folder_node.js
@@ -60,14 +60,6 @@ Polymer({
     return this.isSelectedFolder_ ? 'bookmarks:folder-open' : 'cr:folder';
   },
 
-  /**
-   * @private
-   * @return {string}
-   */
-  getArrowIcon_: function() {
-    return this.isClosed_ ? 'cr:arrow-drop-down' : 'cr:arrow-drop-up';
-  },
-
   /** @private */
   selectFolder_: function() {
     this.dispatch(bookmarks.actions.selectFolder(this.item_.id));