Clean up the Windows watcher.

BUG=
R=rnystrom@google.com

Review URL: https://codereview.chromium.org//313353003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/watcher@37159 260f80e4-7a28-3924-810f-c04153c831b5
3 files changed
tree: 3ff606c2fbb47c3f0a03183a0506675d2ab88313
  1. pkgs/