Don't allow elevation for CHROME_OS.

chrome/chrome_tests.gypi

 # Copyright 2013 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',
       'common/pref_names.cc',
@@ skipping 1978 matching lines @@
             'browser/notifications/message_center_notifications_browsertest.cc',
           ],
         }],
         ['enable_plugins==1', {
           'dependencies': [
             # Runtime dependency.
             '../third_party/widevine/cdm/widevine_cdm.gyp:widevinecdmadapter',
             '../webkit/support/webkit_support.gyp:clearkeycdmadapter',
           ],
         }],
+        ['chromeos==1', {
+          'sources!': [
+            'browser/ui/webui/options/managed_user_set_passphrase_browsertest.js',
+            'browser/ui/webui/options/managed_user_set_passphrase_test.cc',
+            'browser/ui/webui/options/managed_user_set_passphrase_test.h',
+            'browser/ui/webui/options/managed_user_settings_browsertest.js',
+            'browser/ui/webui/options/managed_user_settings_test.cc',
+            'browser/ui/webui/options/managed_user_settings_test.h',
+          ],
+        }],
       ],  # conditions
     },  # target browser_tests
     {
       # Executable that runs each perf browser test in a new process.
       'target_name': 'performance_browser_tests',
       'type': 'executable',
       'msvs_cygwin_shell': 0,
       'msvs_cygwin_dirs': ['<(DEPTH)/third_party/cygwin'],
       'dependencies': [
         'browser',
@@ skipping 1312 matching lines @@
               # more details.
               'DebugInformationFormat': '3',
               'ProgramDataBaseFileName': '<(PRODUCT_DIR)/browser_tests.exe.pdb',
             },
           },
         },
       ],
     }],
   ],  # 'conditions'
 }