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The middle dot symbol is very small. Replace it with a larger symbol,
bullet.

Bug: b/173754433
Test: manual && modified test
Change-Id: Ie7cd84a91b7d7374dff6087954f1f7be9426a62a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2577605
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834305}