Update expectations for threaded animation/transition tests that now pass

This updates expectations for threaded animation and transition layout
tests that were previously flaky but now pass.

TBR=vollick@chromium.org
BUG=248938

Review URL: https://codereview.chromium.org/57563005

git-svn-id: svn://svn.chromium.org/blink/trunk@161466 bbb929c8-8fbe-4397-9dbb-9b2b20218538