Remove deleted folder from base_unittests.isolate

base/base_unittests.isolate

 # 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.
 {
   'conditions': [
     ['OS=="linux"', {
       'variables': {
         'command': [
           '../testing/xvfb.py',
           '<(PRODUCT_DIR)',
           '../tools/swarm_client/run_test_cases.py',
           '<(PRODUCT_DIR)/base_unittests<(EXECUTABLE_SUFFIX)',
         ],
         'isolate_dependency_tracked': [
           '../testing/xvfb.py',
           '<(PRODUCT_DIR)/xdisplaycheck<(EXECUTABLE_SUFFIX)',
         ],
       },
     }],
     ['OS=="linux" or OS=="mac" or OS=="win"', {
       'variables': {
         'isolate_dependency_tracked': [
           '../testing/test_env.py',
           '../tools/swarm_client/run_isolated.py',
           '../tools/swarm_client/run_test_cases.py',
           '<(PRODUCT_DIR)/base_unittests<(EXECUTABLE_SUFFIX)',
         ],
         'isolate_dependency_untracked': [
           'data/',
-          'prefs/test/',
           'test/data/',
         ],
       },
     }],
     ['OS=="mac" or OS=="win"', {
       'variables': {
         'command': [
           '../testing/test_env.py',
           '../tools/swarm_client/run_test_cases.py',
           '<(PRODUCT_DIR)/base_unittests<(EXECUTABLE_SUFFIX)',
         ],
       },
     }],
     ['OS=="win"', {
       'variables': {
         'isolate_dependency_tracked': [
           '<(PRODUCT_DIR)/icudt.dll',
         ],
       },
     }],
   ],
 }