[Webkit-unassigned] [Bug 171567] window.customElements should be associated with each Window

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=171567

--- Comment #7 from Ryosuke Niwa <rniwa at webkit.org> ---
Created attachment 464881

  --> https://bugs.webkit.org/attachment.cgi?id=464881&action=review

WIP2

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