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This class now requires an anchor view (which in practice it always has) and
does not support having an anchor point.

Bug: 989080
Change-Id: I7c0b24e5cbe9794ef87c97ce5e6d174938192170
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1749308
Auto-Submit: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Robert Liao <robliao@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#686467}