This implements the new SSL blocking screen. See the bug for screenshots of what it looks like.

BUG=276540
R=dubroy@chromium.org, palmer@chromium.org, rsleevi@chromium.org
TBR=jochen@chromium.org

Review URL: https://codereview.chromium.org/23965003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@229818 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 229818