Remove Slow test expectation for unregister-then-register-new-script.html
Remove Slow test expectation for unregister-then-register-new-script.html

It was fixed by https://codereview.chromium.org/925863002.

BUG=457678

Review URL: https://codereview.chromium.org/927243002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@190306 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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