Consider merging https://chromium.googlesource.com/chromium/blink/+/a551bb8965cdbdb8938243bc6576992db67f4591 Vector can handle OwnPtr, so we don't have to delete an element in Vector manually.
*** This bug has been marked as a duplicate of bug 121082 ***
I did a much better version of this fix about 10 days before this Blink patch landed. I wonder if there’s some connection?