[webkit-reviews] review requested: [Bug 71499] Only walk up the tree in search of MutationObservers if one has been added : [Attachment 113919] Merged with refactor

[bugzilla-daemon at webkit.org]

Adam Klein <adamk at chromium.org> has asked  for review:
Bug 71499: Only walk up the tree in search of MutationObservers if one has been
added
https://bugs.webkit.org/show_bug.cgi?id=71499

Attachment 113919: Merged with refactor
https://bugs.webkit.org/attachment.cgi?id=113919&action=review