Fix expected results for video loading from multiple origins #33342
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See whatwg/html#7655
When loading video from multiple opaque origins (by a middleman service-worker),
video loading should fail rather than be alllowed and taint the canvas.
That's because some of the video responses may contain metadata such as duration that
would leak to the subsequent requests.
See whatwg/html#2814 (comment) for further details.
This change makes the test case pass in all browsers.