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Per change in spec, the Assistant caption bar should be 48dip tall.
See bug for detailed spec.

Bug: b:119498360
Change-Id: I40cd7cd44a37b9ca99710dad9311b929373b3797
Reviewed-on: https://chromium-review.googlesource.com/c/1336525Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#608232}