Fix for issue 20796

R=paulberry@google.com

Review URL: https://codereview.chromium.org//689383005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41622 260f80e4-7a28-3924-810f-c04153c831b5
Clean up references in comments

R=scheglov@google.com

Review URL: https://codereview.chromium.org//708263002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41623 260f80e4-7a28-3924-810f-c04153c831b5