Remove build references to third_party/cygwin

build/win/setup_cygwin_mount.py

Index: build/win/setup_cygwin_mount.py
diff --git a/build/win/setup_cygwin_mount.py b/build/win/setup_cygwin_mount.py
deleted file mode 100644
index d68a3af41de4d9be634f1d9d05c2a788c3931877..0000000000000000000000000000000000000000
--- a/build/win/setup_cygwin_mount.py
+++ /dev/null
@@ -1,20 +0,0 @@
-# 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.
-
-import os
-import sys
-
-def main():
-  if len(sys.argv) != 2 or sys.argv[1] != '--win-only':
-    return 1
-  if sys.platform in ('win32', 'cygwin'):
-    self_dir = os.path.dirname(sys.argv[0])
-    mount_path = os.path.join(self_dir, "../../third_party/cygwin")
-    batch_path = os.path.join(mount_path, "setup_mount.bat")
-    return os.system(os.path.normpath(batch_path) + ">nul")
-  return 0
-
-
-if __name__ == "__main__":
-  sys.exit(main())