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This is a speculative fix for http://crbug.com/884638. What I believe is
happening is the RenderFrame is being destroyed while the
WeakWrapperSharedURLLoaderFactory is still alive, and a request attempts
to use it. This seems to be happening the most when the AdDelayThrottle
is enabled and is delaying ads requests, which may explain why the
request is finishing after the RenderFrame is destroyed.

Bug: 884638
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: I66960e5c5150345e7fd59f5ab5795414ec482a71
Reviewed-on: https://chromium-review.googlesource.com/1241955Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594489}