Support redirect to relative Uri, as specified by rfc3986#4.2.

BUG=https://code.google.com/p/dart/issues/detail?id=10210
R=sgjesse@google.com

Review URL: https://codereview.chromium.org//14988003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@22413 260f80e4-7a28-3924-810f-c04153c831b5
2 files changed