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Also removes the base::Feature kInterestCohortAPI, as there's no plan
for finch.


Bug: 1062736
Change-Id: I19d847b92ed57ae88a4fc99bc56039c7f4feaa9a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434091
Commit-Queue: Yao Xiao <yaoxia@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812358}