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This reverts commit 1180542b.

Reason for revert: Breaks android perf bots.

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,engedy@chromium.org,dullweber@chromium.org

Change-Id: Id0b1094a32d0c4f8f2ab60ad3744c0e71b8dc085
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1104836
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391120Reviewed-by: Stephen Nusko <nuskos@chromium.org>
Commit-Queue: Stephen Nusko <nuskos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803873}