[MD Bookmarks] Prevent sorting of empty folders.

chrome/browser/resources/md_bookmarks/toolbar.html

Index: chrome/browser/resources/md_bookmarks/toolbar.html
diff --git a/chrome/browser/resources/md_bookmarks/toolbar.html b/chrome/browser/resources/md_bookmarks/toolbar.html
index 9f077ac3d729302dfa33d5c71588e474d587fb2c..94911b0c99c9428d4354458be657c6dbc6059982 100644
--- a/chrome/browser/resources/md_bookmarks/toolbar.html
+++ b/chrome/browser/resources/md_bookmarks/toolbar.html
@@ -64,9 +64,10 @@
     </cr-toolbar>
     <template is="cr-lazy-render" id="dropdown">
       <dialog is="cr-action-menu" role="menu">
-        <button class="dropdown-item"
+        <button id="sortButton"
+            class="dropdown-item"
             on-tap="onSortTap_"
-            disabled="[[!canChangeList_]]"
+            disabled="[[!canSortFolder_]]"
             role="menuitem">
           $i18n{menuSort}
         </button>