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 masonf@chromium.org
Reviewed-by: David Baron dbaron@chromium.org
Auto-Submit: Mason Freed masonf@chromium.org
Cr-Commit-Position: refs/heads/main@{#1380450}