Disable failing search engine tests

chrome/test/functional/PYAUTO_TESTS

 # Copyright (c) 2010 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.
 #
 # This file lists the pyauto tests that run as a part of the functional test
 # suite.
 #
 # Tests can be enabled on a per-platform basis. Tests not listed here will
 # not be run.
 #
@@ skipping 49 matching lines @@
       'ntp',
       'omnibox',
       'passwords',
       'pdf',
       'plugins',
       'popups',
       'prefs',
       'search_engines',
       # crbug.com/67628
       '-search_engines.SearchEnginesTest.testTabToSearch',
+      # crbug.com/70439
+      '-search_engines.SearchEnginesTest.testAddSearchEngine',
+      '-search_engines.SearchEnginesTest.testEditSearchEngine',
+      '-search_engines.SearchEnginesTest.testSearchEngineSpecialChars',
       'special_tabs',
       # crbug.com/67851
       '-special_tabs.SpecialTabsTest.testAboutDNSTab',
       # 'sync',  crbug.com/60970
       'test_basic.SimpleTest.testCanOpenGoogle',
       'themes',
     ],
 
     'win': [
       # testBookmarkBarVisible fails on windows. crbug.com/42823
@@ skipping 92 matching lines @@
     'linux': [
     ],
 
     'chromeos': [
       # crosbug.com/6856
       '-translate.TranslateTest.testSessionRestore',
       '-translate.TranslateTest.testDownloadsNotTranslated',
     ],
   }
 }