[webkit-reviews] review requested: [Bug 83748] [Chromium] Remove existing markers when updating markers. : [Attachment 136835] A patch v0

[bugzilla-daemon at webkit.org]

Hironori Bono <hbono at chromium.org> has asked  for review:
Bug 83748: [Chromium] Remove existing markers when updating markers.
https://bugs.webkit.org/show_bug.cgi?id=83748

Attachment 136835: A patch v0
https://bugs.webkit.org/attachment.cgi?id=136835&action=review