Add a missing import to pkg/watcher.

R=rnystrom@google.com
BUG=

Review URL: https://codereview.chromium.org//104033003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/watcher@30914 260f80e4-7a28-3924-810f-c04153c831b5
1 file changed
tree: 3d037258c723128f025b9bfbe665df3b1ad62961
  1. pkgs/