Fix HTTP IPv6 test

Use the loopback address ::1 to connect from the client. Using the
IPv6 any address does not work on our Windows bots. This is also how the
IPv6 socket tests connect.

R=ricow@google.com
BUG=

Review URL: https://codereview.chromium.org//759223002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41981 260f80e4-7a28-3924-810f-c04153c831b5
cps-ir: Optimize identical used with constants.

R=sigurdm@google.com

Review URL: https://codereview.chromium.org//758953002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@41982 260f80e4-7a28-3924-810f-c04153c831b5