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It was introduced to discard the response body for prefetch, but the
response body (including the cached metadata) is filtered in the
browser process (see content::PrefetchURLLoader) so we don't need to
do that in content/renderer.

Bug: 860403
Change-Id: I97d1feb2bc47727004484d53afcaa27f22ebf41a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037291
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738506}