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

content/content_unittests.isolate

 # Copyright (c) 2013 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.
 {
   'conditions': [
     ['use_x11==0', {
       'variables': {
         'command': [
           '../testing/test_env.py',
           '<(PRODUCT_DIR)/content_unittests<(EXECUTABLE_SUFFIX)',
@@ skipping 43 matching lines @@
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/content_shell.pak',
         ],
       },
     }],
     ['OS=="linux" or OS=="mac" or OS=="win"', {
       'variables': {
         'files': [
           '../testing/test_env.py',
+          '<(PRODUCT_DIR)/content_unittests<(EXECUTABLE_SUFFIX)',
         ],
       },
     }],
     ['OS=="linux"', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/libosmesa.so',
         ],
       },
     }],
@@ skipping 26 matching lines @@
         ],
       },
     }],
   ],
   'includes': [
     '../base/base.isolate',
     '../gin/v8.isolate',
     '../ui/gl/gl.isolate',
   ],
 }