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Ash's touch calibrator view should use NO_ASSETS type if it doesn't
need the shadow. Otherwise, it should use SMALL_SHADOW (or BIG_SHADOW)
which has no difference from the current NO_SHADOW_OPAQUE_BORDER shadow
implementation.

Since that is the last use of NO_SHADOW_OPAQUE_BORDER shadow type,
now we can completely remove this type and related code.

Bug: 940027
Change-Id: I8d9e69a76f3fa240947397c5735163db21fc4803
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2591246Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Commit-Queue: Wei Li <weili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#837194}