Add an HTTP basic auth unit test for an empty username.
Add an HTTP basic auth unit test for an empty username.

R=eroman
BUG=297
Review URL: http://codereview.chromium.org/8859

git-svn-id: http://src.chromium.org/svn/trunk/src@4109 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: f9261bf0792274bf2ed1ada056a1d9dca2be377a
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser