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web-animations-js has some performance impact in wrapping native
`requestAnimationFrame`. In the case of PDF, none of the polyfilled
behavior is necessary as the animation effects are trivially
implemented through native `element.animate`.

R=dsinclair@chromium.org, hnakashima@chromium.org

Change-Id: I9ab09a91e697a491f0c57009293333053a79f618
Reviewed-on: https://chromium-review.googlesource.com/c/1322178Reviewed-by: dsinclair <dsinclair@chromium.org>
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: dstockwell <dstockwell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606183}