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This makes our merge guidelines more permissive for feature work
which is gated behind a flag.

Change-Id: I1b65711006cf04e754570d55c16a12b51ed782f5
Reviewed-on: https://chromium-review.googlesource.com/958035Reviewed-by: Krishna Govind <govind@chromium.org>
Commit-Queue: Alex Mineer <amineer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543551}