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This would have been useful in the investigation of the linked bug,
otherwise we just see an unknown URLLoaderClient impl taking all the
time.

Bug: 931193
Change-Id: Ic198315ed6272155eca8a14ca8f3a29b17b93251
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1574873Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652830}