Bug 1766884 [wpt PR 33848] - Make showPopup and hidePopup throw in invalid situations...

Bug 1766884 [wpt PR 33848] - Make showPopup and hidePopup throw in invalid situations, a=testonly

Automatic update from web-platform-tests
Make showPopup and hidePopup throw in invalid situations

With this CL, both `showPopup()` and `hidePopup()` will throw exceptions
in invalid situations, including:
 - called on non-popup elements
 - called when the popup is in an invalid state (e.g. showPopup on an
   already-showing popup).

See this issue:
  https://github.com/openui/open-ui/issues/511#issuecomment-1099522414

Bug: 1307772
Change-Id: Ib6b623fdcc0fcf7de68f496163df7b47b1c24732
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3610726
Reviewed-by: Joey Arhar <jarhar@chromium.org>
Auto-Submit: Mason Freed <masonf@chromium.org>
Commit-Queue: Mason Freed <masonf@chromium.org>
Cr-Commit-Position: refs/heads/main@{#997279}

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wpt-commits: 7e280cd5814a822cb05b7116eb2cbaf736af2803
wpt-pr: 33848