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This reverts commit e8bb886c.

Reason for revert: Still breaks perf bots: crbug/1124326

Original change's description:
> Reland "Remove BlockThirdPartyCookies preference"
> 
> This is a reland of 1180542b
> 
> BLOCK_THIRD_PARTY_COOKIES usage in clank is fixed:
> https://crrev.com/i/3250184
> 
> Original change's description:
> > Remove BlockThirdPartyCookies preference
> >
> > The boolean BlockThirdPartyCookies preference was replaced by
> > CookieControlsMode enum. Existing settings were migrated since M83.
> > Since all usage of the preference has been removed, the preference
> > can be removed and existing settings cleared.
> >
> > Bug: 1104836
> > Change-Id: Ie6e38b0a424981395c627459d684030ea84a58b7
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387805
> > Reviewed-by: Balazs Engedy <engedy@chromium.org>
> > Reviewed-by: Gabriel Charette <gab@chromium.org>
> > Commit-Queue: Christian Dullweber <dullweber@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#803844}
> 
> Tbr: gab@chromium.org
> Bug: 1104836
> Change-Id: If89041daa0a46da604171acf734b9733d9a24e07
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2390655
> Commit-Queue: Christian Dullweber <dullweber@chromium.org>
> Reviewed-by: Balazs Engedy <engedy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#804217}

TBR=gab@chromium.org,engedy@chromium.org,dullweber@chromium.org

Change-Id: I2a6799c01373c1b5b265fa2518406a2305e1dbd7
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1104836,1124326
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2390912Reviewed-by: Stephen Nusko <nuskos@chromium.org>
Commit-Queue: Stephen Nusko <nuskos@chromium.org>
Auto-Submit: Stephen Nusko <nuskos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804224}