Make base_unittests_run use run_test_cases.py.

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.
 {
   'variables': {
     'isolate_dependency_tracked': [
       '../testing/test_env.py',
+      '../tools/isolate/run_test_cases.py',
       '<(PRODUCT_DIR)/base_unittests<(EXECUTABLE_SUFFIX)',
       'data/json/bom_feff.json',
     ],
     'isolate_dependency_untracked': [
       'data/file_util_unittest/',
     ],
   },
   'conditions': [
     ['OS=="linux"', {
       'variables': {
         'command': [
           '../testing/xvfb.py',
           '<(PRODUCT_DIR)',
+          '../tools/isolate/run_test_cases.py',
           '<(PRODUCT_DIR)/base_unittests<(EXECUTABLE_SUFFIX)',
         ],
         'isolate_dependency_tracked': [
           '../testing/xvfb.py',
           '<(PRODUCT_DIR)/xdisplaycheck<(EXECUTABLE_SUFFIX)',
         ],
       },
     }, {
       'variables': {
         'command': [
           '../testing/test_env.py',
+          '../tools/isolate/run_test_cases.py',
           '<(PRODUCT_DIR)/base_unittests<(EXECUTABLE_SUFFIX)',
         ],
       },
     }],
     ['OS=="win"', {
       'variables': {
         'isolate_dependency_tracked': [
           '<(PRODUCT_DIR)/icudt.dll',
           'data/file_version_info_unittest/FileVersionInfoTest1.dll',
           'data/file_version_info_unittest/FileVersionInfoTest2.dll',
         ],
       },
     }],
   ],
 }