Rename GURL::SchemeUsesTLS to SchemeIsCryptographic.

Since there will increasingly be things like QUIC that offer similar guarantees
but which are not precisely TLS.

Per discussion in https://codereview.chromium.org/1049533002/.

BUG=362214
TBR=brettw,thestig@chromium.org,isherman@chromium.org,mmenke@chromium.org,abarth@chromium.org

Review URL: https://codereview.chromium.org/1049953003

Cr-Commit-Position: refs/heads/master@{#326236}
7 files changed