Remove ArrayUtils

R=scheglov@google.com

Review URL: https://codereview.chromium.org//660563005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41303 260f80e4-7a28-3924-810f-c04153c831b5
Clone tokens when cloning ASTs for constants

R=paulberry@google.com

Review URL: https://codereview.chromium.org//679873002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41304 260f80e4-7a28-3924-810f-c04153c831b5