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This reverts commit 38f657d5.

Reason for revert: https://crbug.com/1019614

Original change's description:
> Convert extensions to use the URLResponseHead mojom types.
> 
> Bug: 984550
> Change-Id: I885fc575b49c4049b83b17cc4c2248daf2525b4e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1876974
> Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
> Commit-Queue: Lucas Gadani <lfg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#709596}

TBR=lazyboy@chromium.org,karandeepb@chromium.org,lfg@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 984550, 1019614
Change-Id: Icd7e03b4c65514f49916fbbba57501cc49d400af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1890006Reviewed-by: Lucas Gadani <lfg@chromium.org>
Commit-Queue: Lucas Gadani <lfg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710827}