Revert of Fix sbox_validation_tests & Make isolate_driver.py include the executable itself

device/device_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)/device_unittests<(EXECUTABLE_SUFFIX)',
       '--brave-new-test-launcher',
       '--test-launcher-bot-mode',
       '--asan=<(asan)',
       '--msan=<(msan)',
       '--tsan=<(tsan)',
     ],
   },
   'conditions': [
     ['OS=="linux" or OS=="mac" or OS=="win"', {
       'variables': {
         'files': [
           '../testing/test_env.py',
+          '<(PRODUCT_DIR)/device_unittests<(EXECUTABLE_SUFFIX)',
           '<(PRODUCT_DIR)/usb_gadget.zip',
           '<(PRODUCT_DIR)/usb_gadget.zip.md5',
         ],
       },
     }],
   ],
   'includes': [
     '../base/base.isolate',
   ],
 }