Revert of Referrer Policy: Update SanitizeForRequest with new default behavior.

Revert of Referrer Policy: Update SanitizeForRequest with new default behavior. (patchset #2 id:20001 of https://codereview.chromium.org/689363003/)

Reason for revert:
Doesn't compile on the debug bot. ?!

Original issue's description:
> Referrer Policy: Update SanitizeForRequest with new default behavior.
>
> Currently, we'll crash when this method is called if a site sets
> `NoReferrerWhenDowngrade`. That seems like something worth fixing. :)
>
> BUG=431711
>
> Committed: https://crrev.com/3b0e841aa8b7d5ca5999f4340b8fa6f73305d3d2
> Cr-Commit-Position: refs/heads/master@{#303629}

TBR=jochen@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=431711
Committed: https://crrev.com/c48f7c3c2037f98037533971a459f56a16c40ceb
Cr-Commit-Position: refs/heads/master@{#303631}

[Mike West, 2014-11-11 12:42:11]

Created Revert of Referrer Policy: Update SanitizeForRequest with new default
behavior.

[commit-bot: I haz the power, 2014-11-11 12:43:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/683233003/1

[commit-bot: I haz the power, 2014-11-11 12:43:31]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-11 12:44:17]

Patchset 1 (id:??) landed as
https://crrev.com/c48f7c3c2037f98037533971a459f56a16c40ceb
Cr-Commit-Position: refs/heads/master@{#303631}

[Mike West, 2014-11-11 13:22:15]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/715513004/ by mkwst@chromium.org.

The reason for reverting is: Testing..