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Also remove the custom URLLoaderFactory in content_hash_fetcher_unittest. This isn't needed anymore as TestURLLoaderFactory now supports Clone.

Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: Id70ec605886a6b0f2cb9bf7392fac4eff85fc1b3
Reviewed-on: https://chromium-review.googlesource.com/1115346Reviewed-by: Doug Turner <dougt@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570813}