[Web Animations] Crash accessing CSSAnimation::bindingsCurrentTime when effect has been set to null
<rdar://problem/42515747>
Created attachment 345649 [details] Patch
Comment on attachment 345649 [details] Patch Attachment 345649 [details] did not pass win-ews (win): Output: https://webkit-queues.webkit.org/results/8637631 New failing tests: webanimations/accessing-current-time-after-clearing-css-animation-effect.html
Created attachment 345667 [details] Archive of layout-test-results from ews200 for win-future The attached test failures were seen while running run-webkit-tests on the win-ews. Bot: ews200 Port: win-future Platform: CYGWIN_NT-6.1-2.9.0-0.318-5-3-x86_64-64bit
Committed r234161: <https://trac.webkit.org/changeset/234161>