Remove HttpStreamFactoryImpl::Job::ssl_info_.

This member is not really used to store state long term,
so it cleaner to pass around an SSLInfo as function arguments.

Also, on an unrelated note, mark members |io_callback_|
and |delegate_| const.

BUG=475060

Review-Url: https://codereview.chromium.org/2895623002
Cr-Commit-Position: refs/heads/master@{#477746}
2 files changed