Bug 1796033 [wpt PR 36545] - Remove pop-up test for unscopable `popup…

…` attr, a=testonly

Automatic update from web-platform-tests
Remove pop-up test for unscopable `popup` attr

There was a previous web compat issue with event handler attributes
calling functions called "popup()". As a result, we made the `popup`
attribute unscopable, so this would not break the web. However,
with the change of name to `popUp` for the IDL attribute, this
compat issue likely doesn't exist, for the same reasons that this
rename fixed the general compat issue [1].

This CL removes the test for unscopable. The [2] CL actually made
the attribute scopable.

[1] openui/open-ui#546
[2] https://chromium-review.googlesource.com/c/chromium/src/+/3954386

Bug: 1307772
Change-Id: I603e75338e1ccb925e6f145870fa6fecc68c61fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3963911
Reviewed-by: Joey Arhar <jarhar@chromium.org>
Commit-Queue: Mason Freed <masonf@chromium.org>
Auto-Submit: Mason Freed <masonf@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1062228}

--

wpt-commits: e26f46e26e4b94d890b34e9a73b58f5a395ff2b8
wpt-pr: 36545