DOM: Suppress mutation events during moveBefore()
Bug: 40150299
Change-Id: I70dffea4c1c81c5a12285949b7112624f7e3ff8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5797545
Reviewed-by: Mason Freed masonf@chromium.org
Commit-Queue: Dominic Farolino dom@chromium.org
Cr-Commit-Position: refs/heads/main@{#1343986}