Remove cookie first-party URL redirect logic from Blink.

It's handled in the browser process now, as of
https://codereview.chromium.org/264613006.

BUG=368813

Review URL: https://codereview.chromium.org/285153003

git-svn-id: svn://svn.chromium.org/blink/trunk@174183 bbb929c8-8fbe-4397-9dbb-9b2b20218538