Move username password to CrosBrowserOptions.

BUG=277033
TEST=manual
NOTRY=True

Review URL: https://codereview.chromium.org/99043005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@242194 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 242194