Change the bypass keyword to "danger".

This was designed for testing, but the old value is all over the Internet now
and users are doing dangerous things with it.

BUG=none
R=felt@chromium.org, palmer@chromium.org

Review URL: https://codereview.chromium.org/150733003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250728 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 250728