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Previously, when we came back from a failed fetch, we would erase the
hints fetcher (which would subsequently erase the active URL loader).
But OnURLLoadComplete wants to destruct the active URL loader on its
own and at that time, active_url_loader_ is null.

Bug: 1050481
Change-Id: I0d49796fd0d70a3ab1eb52233a44c579d84fd179
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063788Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Reviewed-by: rajendrant <rajendrant@chromium.org>
Commit-Queue: Sophie Chang <sophiechang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742432}