We should revert fast/mediastream/video-srcObject-set-twice.html to be a ref test. In https://bugs.webkit.org/show_bug.cgi?id=261920, to remove the flakiness, we moved to a layout test as the rendering is not always correct. We should fix the underlying issue.
When we find and fix the issue, we should revert the test changes from https://github.com/WebKit/WebKit/pull/18338
<rdar://problem/116853597>