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The difference between NO_SHADOW and NO_ASSETS is that we still draw a
border stroke for the former. Since live caption uses the same
background color for different themes, it should not use a themed system
border stroke. This CL removes the border stroke which is not visible
anyway.

Bug: 940027
Change-Id: I249191cfd51e82ea835e7e1f5997ac98a9c33bab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2590706Reviewed-by: Abigail Klein <abigailbklein@google.com>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836888}