Auto merge of #23410 - tigercosmos:proxywindow-spec-update, r=KiChjang

spec update: window.name deals with lack of browsing context

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new [spec](https://html.spec.whatwg.org/multipage/window-object.html#dom-name):

The name attribute's getter must run these steps:

1. If this Window object's browsing context is null, then return the empty string.
2. Return this Window object's browsing context's name.

The name attribute's setter must run these steps:

1.  If this Window object's browsing context is null, then return.
2. Set this Window object's browsing context's name to the given value.

What is `null` here? According to [spec](https://html.spec.whatwg.org/multipage/browsers.html#concept-document-bc)
>  A Document's browsing context is the browsing context whose session history contains the Document, if any such browsing context exists and has not been discarded, and null otherwise.

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<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] passed ` tests/wpt/web-platform-tests/html/browsers/the-window-object/name-attribute.window.js`
- [X] These changes fix #22915

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