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Spec:
https://drafts.csswg.org/web-animations-1/#remove-replaced-animations

Intent:
https://groups.google.com/a/chromium.org/forum/#!msg/blink-dev/H5sz_dg6fKc/1X7K7U4XCgAJ

Bug: 981905
Change-Id: I9267e3e4fda14133f2edcc0e8aea1e8a031959a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2020245
Commit-Queue: Kevin Ellis <kevers@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735437}