MD Downloads: fix search spinner when terms are the same

chrome/browser/resources/md_downloads/toolbar.js

 // 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.
 
 cr.define('downloads', function() {
   var Toolbar = Polymer({
     is: 'downloads-toolbar',
 
     properties: {
       downloadsShowing: {
@@ skipping 69 matching lines @@
       this.boundClose_ = this.boundClose_ || this.closeMoreActions_.bind(this);
       window.addEventListener('resize', this.boundClose_);
     },
 
     /**
      * @param {!CustomEvent} event
      * @private
      */
     onSearchChanged_: function(event) {
       var actionService = downloads.ActionService.getInstance();
-      actionService.search(/** @type {string} */ (event.detail));
-      this.spinnerActive = actionService.isSearching();
+      if (actionService.search(/** @type {string} */ (event.detail)))
+        this.spinnerActive = actionService.isSearching();
       this.updateClearAll_();
     },
 
     /** @private */
     onOpenDownloadsFolderTap_: function() {
       downloads.ActionService.getInstance().openDownloadsFolder();
     },
 
     /** @private */
     updateClearAll_: function() {
       this.$$('paper-menu .clear-all').hidden = !this.canClearAll();
     },
   });
 
   return {Toolbar: Toolbar};
 });