Re: [w3c/ServiceWorker] consider Client behavior for windows where initial about:blank is replaced with a loaded document (#1091)

@bzbarsky 

> In terms of your proposed behavior, that means opening the queue when onload fires for initial about:blank could be a problem.

That appears to be what happens already, unless I'm missing something https://clear-princess.glitch.me/.

That above test keeps sending messages to the iframe, but messages sent before `addEventListener('message', listener)` are gone, so the queue must have been open already.

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