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We a redirect commits, we should take the referrer policy from the
request we actually send and not from the one we intended to send.

Also, when the renderer tells the browser about a new navigation, always
update the referrer together with the URL

Depends on https://codereview.chromium.org/126753002/ in blink

BUG=331941
R=nasko@chromium.org
TEST=browser_tests:ReferrerPolicyTest.*

Review URL: https://codereview.chromium.org/128173002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244138 0039d316-1c4b-4281-b951-d872f2087c98