chrome_paths: refactor and sanitize cache directory handling

chrome/chrome_tests.gypi

 # 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.
 
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
@@ skipping 1524 matching lines @@
         'browser/visitedlink_unittest.cc',
         'browser/web_applications/web_app_unittest.cc',
         'browser/webdata/web_data_service_test_util.h',
         'browser/webdata/web_data_service_unittest.cc',
         'browser/webdata/web_database_unittest.cc',
         'browser/web_resource/web_resource_service_unittest.cc',
         'browser/window_sizer_unittest.cc',
         'browser/wrench_menu_model_unittest.cc',
         'common/bzip2_unittest.cc',
         'common/child_process_logging_mac_unittest.mm',
+        'common/chrome_paths_unittest.cc',
         'common/common_param_traits_unittest.cc',
         'common/content_settings_helper_unittest.cc',
         'common/deprecated/event_sys_unittest.cc',
         'common/desktop_notifications/active_notification_tracker_unittest.cc',
         'common/extensions/extension_action_unittest.cc',
         'common/extensions/extension_extent_unittest.cc',
         'common/extensions/extension_file_util_unittest.cc',
         'common/extensions/extension_icon_set_unittest.cc',
         'common/extensions/extension_l10n_util_unittest.cc',
         'common/extensions/extension_localization_peer_unittest.cc',
@@ skipping 1827 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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 # tab-width:2
 # indent-tabs-mode:nil
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