WebUI: cr-search-field, do not call delegate if search query did not change.

chrome/browser/resources/md_history/history_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.
 
 /**
  * @constructor
  * @implements {SearchFieldDelegate}
  * @param {!HistoryToolbarElement} toolbar This history-toolbar.
  */
 function ToolbarSearchFieldDelegate(toolbar) {
@@ skipping 79 matching lines @@
       return;
 
     this.searchTerm = search;
     var searchField = /** @type {!CrToolbarElement} */(this.$['main-toolbar'])
                           .getSearchField();
     searchField.showAndFocus();
     searchField.setValue(search);
   },
 
   /**
-   * If the search term has changed reload for the new search.
+   * @param {string} searchTerm
    */
   onSearch: function(searchTerm) {
-    if (searchTerm != this.searchTerm)
-      this.searchTerm = searchTerm;
+    this.searchTerm = searchTerm;
   },
 
   attached: function() {
     this.searchFieldDelegate_ = new ToolbarSearchFieldDelegate(this);
     /** @type {!CrToolbarElement} */(this.$['main-toolbar']).getSearchField()
         .setDelegate(this.searchFieldDelegate_);
   },
 
   onClearSelectionTap_: function() {
     this.fire('unselect-all');
@@ skipping 14 matching lines @@
   numberOfItemsSelected_: function(count) {
     return count > 0 ? loadTimeData.getStringF('itemsSelected', count) : '';
   },
 
   getHistoryInterval_: function(queryStartTime, queryEndTime) {
     // TODO(calamity): Fix the format of these dates.
     return loadTimeData.getStringF(
       'historyInterval', queryStartTime, queryEndTime);
   }
 });