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This CL updates hosted app menu buttons to be a circle instead of a
squircle. This matches the main browser app menu button highlight shape.

Before: https://bugs.chromium.org/p/chromium/issues/attachment?aid=382151&signed_aid=8nMn1jvoQMiuwbo9hYOZnw==&inline=1
After: https://bugs.chromium.org/p/chromium/issues/attachment?aid=382152&signed_aid=dqni06i4dkv3UxZYxCF6FA==&inline=1

Bug: 918093
Change-Id: I9137331b23047570a1a7becd97ee6be6a04d0abe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1496399
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: Jay Harris <harrisjay@chromium.org>
Auto-Submit: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637980}