Bug 1930032 [wpt PR 49050] - Implement dialog.requestClose() [4/N], a…

…=testonly

Automatic update from web-platform-tests
Implement dialog.requestClose() [4/N]

This implements dialog.requestClose() and adds a test.

See spec PR for details:
  whatwg/html#10737

Bug: 376516550
Change-Id: Iaac3d89c28844d2b54ff5b1a7b68dc356d1fd172
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5991017
Commit-Queue: Mason Freed <masonfchromium.org>
Reviewed-by: David Baron <dbaronchromium.org>
Auto-Submit: Mason Freed <masonfchromium.org>
Cr-Commit-Position: refs/heads/main{#1380450}

--

wpt-commits: 97a34c26ea3a3bfeacc0f40fc733d464c3f4d377
wpt-pr: 49050

UltraBlame original commit: 4caf91ac4ff80bb8e77480009090bbaa21eae410