🚨 Error: The fetching process for the media resource was aborted by the user agent at the user's request.

Details
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**Error report:** [link](http://go/ampe/CIyejIz8jryOYg)
**First seen:** Jul 16, 2019
**Frequency:** ~ 7,281/day

Stacktrace
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Error: The fetching process for the media resource was aborted by the user agent at the user's request.

    at the-fetching-process-for-the-media-resource-was-aborted-by-the-user-agent-at-the-user-s-request.js:1:1

/cc @ampproject/release-on-duty

Begin with the linked error report and the supplied stacktrace for the media-resource fetch abort. The issue names no source file, test, reproduction, or requested behavior, so first establish the cause and a scoped change. Done would require a confirmed fix or explanation backed by a regression test or reproduction.

Written by the indexing model from the issue text.