Check for empty paths in path_util

chrome/chrome_tests_unit.gypi

 # Copyright 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.
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 928 matching lines @@
         'browser/extensions/extension_creator_filter_unittest.cc',
         'browser/extensions/extension_error_controller_unittest.cc',
         'browser/extensions/extension_function_test_utils.cc',
         'browser/extensions/extension_function_test_utils.h',
         'browser/extensions/extension_garbage_collector_unittest.cc',
         'browser/extensions/extension_garbage_collector_chromeos_unittest.cc',
         'browser/extensions/extension_gcm_app_handler_unittest.cc',
         'browser/extensions/extension_icon_manager_unittest.cc',
         'browser/extensions/extension_install_checker_unittest.cc',
         'browser/extensions/extension_message_bubble_controller_unittest.cc',
+        'browser/extensions/extension_path_util_unittest.cc',
         'browser/extensions/extension_prefs_unittest.cc',
         'browser/extensions/extension_prefs_unittest.h',
         'browser/extensions/extension_service_test_base.h',
         'browser/extensions/extension_service_test_base.cc',
         'browser/extensions/extension_service_unittest.cc',
         'browser/extensions/extension_special_storage_policy_unittest.cc',
         'browser/extensions/extension_sync_data_unittest.cc',
         'browser/extensions/extension_test_message_listener_unittest.cc',
         'browser/extensions/extension_ui_unittest.cc',
         'browser/extensions/extension_warning_badge_service_unittest.cc',
@@ skipping 1911 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }