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

mojo/mojo_js_unittests.isolate

 # Copyright 2014 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': [
     '../third_party/icu/icu.isolate',
   ],
   'conditions': [
     ['OS=="win" or OS=="mac" or OS=="linux"', {
       'variables': {
         'command': [
           '../testing/test_env.py',
           '<(PRODUCT_DIR)/mojo_js_unittests<(EXECUTABLE_SUFFIX)',
           '--brave-new-test-launcher',
           '--test-launcher-bot-mode',
         ],
         'files': [
           '../gin/test/expect.js',
           '../testing/test_env.py',
           '<(PRODUCT_DIR)/gen/mojo/public/interfaces/bindings/tests/',
+          '<(PRODUCT_DIR)/mojo_js_unittests<(EXECUTABLE_SUFFIX)',
           'bindings/js/',
           'public/js/bindings/',
         ],
       },
     }],
     ['OS=="win"', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/mojo_public_test_support.dll',
         ],
       },
     }],
     ['OS=="linux"', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/lib/libmojo_public_test_support.so',
         ],
       },
     }],
     ['OS=="mac"', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/libmojo_public_test_support.dylib',
         ],
       },
     }],
   ],
 }