[MD History] Fix toolbar dates in grouped mode.

chrome/test/data/webui/history_browsertest.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.
 
 GEN('#include "chrome/test/data/webui/history_ui_browsertest.h"');
 
 /** @const */ var TOTAL_RESULT_COUNT = 160;
 /** @const */ var WAIT_TIMEOUT = 200;
 
 /**
@@ skipping 243 matching lines @@
   } else if (beginTime) {
     queryStartTime = Date(beginTime);
     queryEndTime = Date(endTime);
   }
 
   callFrontendAsync(
       'historyResult',
       {
         term: searchText,
         finished: finished,
-        queryStartTime: queryStartTime,
-        queryEndTime: queryEndTime
+        queryInterval: queryStartTime + ' - ' + queryEndTime,
       },
       results);
 }
 
 /**
  * Fixture for History WebUI testing which returns some fake history results
  * to the frontend.
  * @extends {HistoryWebUIFakeBackendTest}
  * @constructor
  */
@@ skipping 858 matching lines @@
 TEST_F('HistoryWebUIWithSchemesTest', 'groupingWithSchemes', function() {
   // Switch to the week view.
   $('timeframe-controls').querySelectorAll('input')[1].click();
   waitForCallback('historyResult', function() {
     // Each URL should be organized under a different "domain".
     expectEquals(document.querySelectorAll('.entry').length, 4);
     expectEquals(document.querySelectorAll('.site-domain-wrapper').length, 4);
     testDone();
   });
 });