Add DCHECK to check that autofill server never returns UNKNOWN_TYPE
Add DCHECK to check that autofill server never returns UNKNOWN_TYPE

BUG=64288
TEST=none

Review URL: http://codereview.chromium.org/6020003

git-svn-id: http://src.chromium.org/svn/trunk/src@69639 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: a6f3685880c22249261f002690e43ba87b91d073
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