Redirect pure isolate print to helper isolate.

R=podivilov@chromium.org,vsm@google.com
BUG=4686

Review URL: https://codereview.chromium.org//13185006

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@20668 260f80e4-7a28-3924-810f-c04153c831b5
4 files changed