Delete some msvs_cygwin_shell:0

build/isolate.gypi

 # Copyright (c) 2012 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.
 
 # This file is meant to be included into a target to provide a rule
 # to "build" .isolate files into a .isolated file.
 #
 # To use this, create a gyp target with the following form:
 # 'conditions': [
 #   ['test_isolation_mode != "noop"', {
@@ skipping 103 matching lines @@
           # the following arguments.
           'action': [ '--outdir', '<(PRODUCT_DIR)/ ' ],
         }, {
           'action': [ '--outdir', '<(test_isolation_outdir)' ],
         }],
         ['test_isolation_fail_on_missing == 0', {
             'action': ['--ignore_broken_items'],
           },
         ],
       ],
-
-      'msvs_cygwin_shell': 0,
     },
   ],
 }