Also disable HistoryWebUITest.multipleSelect on Mac due to flakeness.

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 488 matching lines @@
       // The next entry after the deleted ones should now be the first.
       expectEquals(document.querySelector('.title a').textContent,
                    nextEntry.textContent);
       testDone();
     });
   });
 });
 
 /**
  * Test selecting multiple entries using shift click.
- * Disabled due to time out on win: crbug/375910
+ * Disabled due to time out on win and mac: crbug/375910
  */
-GEN('#if defined(OS_WIN)');
+GEN('#if defined(OS_WIN) || defined(OS_MACOSX)');
 GEN('#define MAYBE_multipleSelect DISABLED_multipleSelect');
 GEN('#else');
 GEN('#define MAYBE_multipleSelect multipleSelect');
 GEN('#endif');
 TEST_F('HistoryWebUITest', 'MAYBE_multipleSelect', function() {
   var checkboxes = document.querySelectorAll(
       '#results-display input[type=checkbox]');
 
   var getAllChecked = function() {
     return Array.prototype.slice.call(document.querySelectorAll(
@@ skipping 406 matching lines @@
 TEST_F('HistoryWebUIWithSchemesTest', 'groupingWithSchemes', function() {
   // Switch to the week view.
   $('timeframe-filter-week').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();
   });
 });