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This CL adds grey separators to SharesheetBubbleView to align
with mocks. Screenshot included in bug.

Bug: 1147724
Change-Id: I50e0a2eb058ddfe2c8c1ca1b4df079d4d1aba4ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532536
Commit-Queue: Melissa Zhang <melzhang@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826546}