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These two items are now in the Tab menu, reusing the existing
strings and machinery from the context menu. I considered
adding separate descriptor strings but it seemed like extra work
for no particular gain.

This is the design we settled on during our offline discussion :)

Bug: 1017344
Change-Id: I5fe6798d4bf0f217e3065373d43d0ec217a4bcb4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1913974Reviewed-by: Greg Thompson <grt@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715267}