Rename is_hsts_host to fatal.

Per wtc: the old name was too specific, and became confusing because we now
also have certificate errors that users cannot override, but for reasons
other than (although still closely related to) HSTS.

BUG=109941
Review URL: https://chromiumcodereview.appspot.com/9188019

git-svn-id: http://src.chromium.org/svn/trunk/src/net@117968 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
9 files changed