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Previously, as reported in the bug, Assistant Ui was *not* closing
in tablet mode.

Bug: b:150252578
Change-Id: I3410fa8fcebc13d564f12f84dc7fe731e1e32ab6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076097
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746932}