MD Downloads: fix double click bug

chrome/browser/resources/md_downloads/crisper.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * The global object.
  * @type {!Object}
  * @const
  */
 var global = this;
@@ skipping 1742 matching lines @@
 
     /** @this {ActionLink} */
     createdCallback: function() {
       // Action links can start disabled (e.g. <a is="action-link" disabled>).
       this.tabIndex = this.disabled ? -1 : 0;
 
       if (!this.hasAttribute('role'))
         this.setAttribute('role', 'link');
 
       this.addEventListener('keydown', function(e) {
-        if (!this.disabled && e.keyIdentifier == 'Enter') {
+        if (!this.disabled && e.keyIdentifier == 'Enter' && !this.href) {
           // Schedule a click asynchronously because other 'keydown' handlers
           // may still run later (e.g. document.addEventListener('keydown')).
           // Specifically options dialogs break when this timeout isn't here.
           // NOTE: this affects the "trusted" state of the ensuing click. I
           // haven't found anything that breaks because of this (yet).
           window.setTimeout(this.click.bind(this), 0);
         }
       });
 
       function preventDefault(e) {
@@ skipping 8691 matching lines @@
     Manager.get().updateItem_(index, data);
   };
 
   return {Manager: Manager};
 });
 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 window.addEventListener('load', downloads.Manager.onLoad);