Convert installer_util_unittests to run exclusively on Swarming

chrome/installer_util_unittests.isolate

 # Copyright 2015 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.
-
 {
-  'includes': [
-    '../../legion.isolate'
-  ],
   'conditions': [
-    ['multi_machine == 1', {
+    ['OS=="win"', {
       'variables': {
         'command': [
-          'python',
-          '../../run_task.py',
+          '<(PRODUCT_DIR)/installer_util_unittests.exe',
         ],
         'files': [
-          'task_test.isolate',
-          'task_test.py',
+          '<(PRODUCT_DIR)/installer_util_unittests.exe',
+          'test/data/extensions/',
+          'test/data/installer/',
         ],
       },
     }],
   ],
+  'includes': [
+    '../base/base.isolate',
+  ],
 }