Refactor transmission of security of source and http_only mods in cookie_monster.cc.

Prep CL for https://codereview.chromium.org/2882063002

BUG=721395
[email protected]

Review-Url: https://codereview.chromium.org/2903213004
Cr-Commit-Position: refs/heads/master@{#481002}
2 files changed