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

content/content_gl_tests.isolate

 # Copyright 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': [
     ['OS=="android" or OS=="linux" or OS=="mac" or OS=="win"', {
       'variables': {
         'command': [
           '<(PRODUCT_DIR)/content_gl_tests<(EXECUTABLE_SUFFIX)',
         ],
+        'files': [
+          '<(PRODUCT_DIR)/content_gl_tests<(EXECUTABLE_SUFFIX)',
+        ],
       },
     }],
     # TODO(kbr): these two dependencies seem to be necessary when
     # running the component build to avoid "Failed to mmap datapack"
     # errors. Should investigate further.
     ['OS=="linux" or OS=="win"', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/content_resources.pak',
           '<(PRODUCT_DIR)/ui_test.pak',
@@ skipping 26 matching lines @@
           '<(PRODUCT_DIR)/content.dll.pdb',
         ],
       },
     }],
   ],
   'includes': [
     '../base/base.isolate',
     '../gin/v8.isolate',
   ],
 }