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We are no longer using ZeroSuggestVariant.

Instead, we are moving to using separate base::Feature flags for each
experiment.

See here for a discussion about removing this:
http://g/chrome-omnibox-team/lNT8EsY1gFI

Bug: 1124050
Change-Id: I20fb3d79ad2ab64fb7daf52729449cbad3193e75
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2430227
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813359}