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The flag and base::Feature instance was removed, but still
flag description strings and base::Feature declaration are
remained.

This patch removes them.

Bug: 963307
Change-Id: Ic38e5dffabbb4967ee95e229d99ffd77d5950509
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063618
Auto-Submit: Takashi Toyoshima <toyoshim@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742979}