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ash_shell (and ash_shell_with_content) were introduced for
quick-checking of ash behaviors, as it's fast to build. However,
it's not used by many people, and I've noticed that it's broken
in many ways.

I believe no one is using it actually, so I think it's the time
to remove it at all.

ash_ui_perftests, which depends on ash_shell_lib_with_content,
is also removed, as it was introduced for a purpose but isn't
used actually.

Bug: none
Test: build passes
Change-Id: I68d4de5b0172f51240a99e61facbe4f7ee606ed4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2307909Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790124}