Bug 1642045 Comment 53 Edit History

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This started to perma fail.
[Push where it first appeared](https://treeherder.mozilla.org/jobs?repo=autoland&resultStatus=testfailed%2Cbusted%2Cexception%2Crunnable&revision=bbeba8b14a2f58e4e936b042e4ad0ff12f666e3b&searchStr=browsertime&selectedTaskRun=GJ6ei5RcQVCajnvCRa62fQ.0)
[Failure log](https://treeherder.mozilla.org/logviewer?job_id=354652789&repo=autoland&lineNumber=1089)

Affected platforms so far are:
Linux 18.04 x64 WebRender Shippable opt
OS X 10.14 WebRender Shippable opt
OS X 10.15 WebRender Shippable opt
Windows 10 x64 WebRender Shippable opt
Sorry for the spam. It was perma failing but the issue got resolved by a backout.

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