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This CL removes the gap between infobar and bottom sheet to make them work more
nicely. Bottom sheet's top shadow height dimension needs to be bigger.

Bug: 1025098
Change-Id: I0264d19b2ab75efbdee3a4cadc697ea7ebc1a9ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1943783Reviewed-by: Matthew Jones <mdjones@chromium.org>
Commit-Queue: Jinsuk Kim <jinsukkim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720708}