[webkit-reviews] review requested: [Bug 163221] Update ProgressEvent to stop using legacy [ConstructorTemplate=Event] : [Attachment 291140] Patch

[bugzilla-daemon at webkit.org]

Chris Dumez <cdumez at apple.com> has asked  for review:
Bug 163221: Update ProgressEvent to stop using legacy
[ConstructorTemplate=Event]
https://bugs.webkit.org/show_bug.cgi?id=163221

Attachment 291140: Patch

https://bugs.webkit.org/attachment.cgi?id=291140&action=review