[webkit-reviews] review requested: [Bug 70436] [MutationObservers] Implement basic subtree observation : [Attachment 111856] Extracted helper function

[bugzilla-daemon at webkit.org]

Adam Klein <adamk at chromium.org> has asked  for review:
Bug 70436: [MutationObservers] Implement basic subtree observation
https://bugs.webkit.org/show_bug.cgi?id=70436

Attachment 111856: Extracted helper function
https://bugs.webkit.org/attachment.cgi?id=111856&action=review