Make update_href accept a &Url argument instead of DOMString

[jdm]

This is a followup to the changes in #11264. This will allow removing some duplication in all of the callers of update_href in htmlanchorelement.rs. We can call it from inside the match, rather that storing an intermediary value before calling it.

Code: components/script/dom/htmlanchorelement.rs
Tests: ./mach test-wpt tests/wpt/web-platform-tests/html/semantics/text-level-semantics/the-a-element/ (should continue to pass)

[KiChjang]

I suspected that the crash in #11261 was precisely because update_href was called from within the match, since self.url is borrowed mutably in the match expression, and subsequently borrowed again in update_href.

[metajack]

@jdm #11261 made the exact opposite change on purpose. Did we not want to make that change? Is there some other way to address the issue @KiChjang was concerned about?

[jdm]

#11261 never established a cause and effect, since update_href clearly contains no borrow ofself.url.

[KiChjang]

But the logs in #11261 clearly does state that there's a call to .borrow() in update_href, and @paulrouget reported no problems after applying #11264 locally.

[jdm]

Removing the easy label until we resolve #11281.