Switch //net functions to use SchemeIsCryptographic() instead of SchemeIsSecure().

SchemeIsCryptographic more appropriately reflects
the intent (that a cryptographically secure
transport was used - e.g. https:// and wss:// schemes),
whereas SchemeIsSecure also considers situations where
the scheme is locally trusted (e.g. filesystem URLs)

BUG=362214

Review URL: https://codereview.chromium.org/1131963003

Cr-Commit-Position: refs/heads/master@{#329966}
7 files changed