Remove legacy cache-only from HostResolver fuzzer

Cache-only is now selected through |source|, and the fuzzer already
supports fuzzing that to the LOCAL_ONLY value.

Bug: 922699
Change-Id: Ie5660de4d67e801426f8ec73c10e7e255bd06465
Reviewed-on: https://chromium-review.googlesource.com/c/1459783
Auto-Submit: Eric Orth <ericorth@chromium.org>
Reviewed-by: Asanka Herath <asanka@chromium.org>
Commit-Queue: Eric Orth <ericorth@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631802}
1 file changed