Fix sbox_validation_tests & Make isolate_driver.py include the executable itself

chromeos/chromeos_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.
 {
   'variables': {
     'command': [
       '../testing/test_env.py',
       '<(PRODUCT_DIR)/chromeos_unittests<(EXECUTABLE_SUFFIX)',
       '--brave-new-test-launcher',
       '--test-launcher-bot-mode',
       '--asan=<(asan)',
       '--msan=<(msan)',
       '--tsan=<(tsan)',
     ],
     'files': [
       '../net/data/',
       '../testing/test_env.py',
-      '<(PRODUCT_DIR)/chromeos_unittests<(EXECUTABLE_SUFFIX)',
       'test/data/',
     ],
   },
   'includes': [
     '../base/base.isolate',
   ],
 }