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This is a regression from my previous cl crrev.com/c/2099291. I don't
have access to a win7 but this speculative fix readds the MessageView
specific HighlightPathGenerator which insets the ring a bit.

On my cros-linux you can see the ring is now within the notification
bounds.

Test: manual
Bug: 1067594
Change-Id: Iddaf378dc864f2a438d5a64174592faa4bf66c73
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2136054Reviewed-by: Tim Song <tengs@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756450}