Re-enable gtalk pyauto test since related bug was fixed.

chrome/test/functional/PYAUTO_TESTS

 # 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.
 #
 # 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 131 matching lines @@
       # crbug.com/102517 -- external webpage throws 500
       '-special_tabs.SpecialTabsTest.testAboutAppCacheTab',
       # Flaky: crbug.com/67851
       '-special_tabs.SpecialTabsTest.testAboutDNSTab',
       # crbug.com/88574
       '-special_tabs.SpecialTabsTest.testSpecialURLTabs',
       # crbug.com/88593
       '-sync.SyncTest.testPersonalStuffSyncSection',
       # crbug.com/95140
       '-translate.TranslateTest.testGoBackAndForwardToTranslatePage',
-      # crbug.com/123402
-      '-gtalk.test_basic.BasicTest.testBasicFunctionality',
     ],
 
     'win': [
       # Enable sync.SyncIntegrationTest only for windows CONTINUIOUS,
       # which contains the sync protobufs.
       #'sync.SyncIntegrationTest',
 
       # ==================================================
       # Disabled tests that need to be investigated/fixed.
       # ==================================================
@@ skipping 558 matching lines @@
 
   # HTML5 media performance tests.
   'AV_PERF': {
      'linux': [
        'media.media_constrained_network_perf',
        'media.media_jerky',
        'media.media_stat_perf',
      ],
   },
 }