Change Uri methods taking a decode argument, to now take an encoding.
Change Uri methods taking a decode argument, to now take an encoding.

This finished the integration of dart:convert into Uri.

BUG=
R=sgjesse@google.com

Review URL: https://codereview.chromium.org//24122002

git-svn-id: a0fc6a377c96b9059f80895148836233a16d98be@27426 260f80e4-7a28-3924-810f-c04153c831b5

dart-lang/http,dart-lang/http,dart-lang/http,donny-dont/http,dart-lang/http,dart-lang/http,kasperpeulen/http,dart-lang/http,dart-lang/http,dart-lang/http