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With the removal of URLRequestFileJob and URLRangeRequestJob, these
classes are no longer in use.

Bug: 934009
Change-Id: I68632b3d79609d72762c4fd8a186eac6d5d7c36b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869726
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Eric Roman <eroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709238}