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flags: remove deleted flags

This change removes a bunch of flags from flag-metadata that have already been
deleted from other source files.

Bug: None
Change-Id: I0d4dad01a01dc175d1003e68c25745bc674d85f6
Reviewed-on: https://chromium-review.googlesource.com/c/1458677
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630034}