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This patch removes an unused bottom shadow from the bottom sheet's
toolbar. Modern design does not require one by default, existing
sheet contents provide their own shadow when needed, and the existing
one caused issues on Android J devices.

Bug: 829454
Change-Id: I4cf9a36e6efbf107499516181f97c57c556632cf
Reviewed-on: https://chromium-review.googlesource.com/1068653Reviewed-by: Theresa <twellington@chromium.org>
Commit-Queue: Matthew Jones <mdjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#560838}