Update a Web Animations spec link
Update a Web Animations spec link

https://github.com/w3c/web-animations/issues/89

BUG=460722
NOTRY=true

Review URL: https://codereview.chromium.org/1099063002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@194097 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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