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This CL just adds a base::Feature to guard the "clobber" as ZeroSuggest
entrypoint.

Adds it to about:flags too.

Bug: 1106096
Change-Id: I63f3dbdb60a986dd0fde58d8da3007603d8f2349
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2327844Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#793214}