Fix the pkg/http multipart tests.
Fix the pkg/http multipart tests.

Review URL: https://codereview.chromium.org//12385010

git-svn-id: a0fc6a377c96b9059f80895148836233a16d98be@19200 260f80e4-7a28-3924-810f-c04153c831b5

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