Bug 1815492 [wpt PR 38392] - Rip out all of the beautiful bespoke Pop…

…over animation stuff, a=testonly

Automatic update from web-platform-tests
Rip out all of the beautiful bespoke Popover animation stuff

This isn't part of the landed spec [1], and will be replaced by
a combination of these five CSSWG issues:

- w3c/csswg-drafts#4441
- w3c/csswg-drafts#6429
- w3c/csswg-drafts#8174
- w3c/csswg-drafts#8189
- w3c/csswg-drafts#8389

After this CL, you will no longer be able to animate your
popover like this:

```
  [popover] {
    opacity: 0;
    transition: opacity 0.2s;
  }
  [popover]:open {
    opacity: 1;
  }
```

Instead you'll need to use CSS animations or (eventually) transitions
and you'll have to explicitly declare the `display` and `top-layer`
properties:

```
  transition: opacity 0.2s, display 0.2s, top-layer 0.2s;
```

[1] https://html.spec.whatwg.org/multipage/popover.html

Bug: 1307772,1413556
Change-Id: I4877dd69a06f2624bdb463b065b2e2b66cbf1154
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4225730
Reviewed-by: David Baron <[email protected]>
Commit-Queue: David Baron <[email protected]>
Commit-Queue: Mason Freed <[email protected]>
Auto-Submit: Mason Freed <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1107048}

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wpt-commits: 635df2dae0185211850d336ed6320ec35e4f4f3f
wpt-pr: 38392