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URLFetcher will stop working with advent of Network Service, and
SimpleURLLoader is the replacement API for most clients.
This CL migrates Android's ContextualSearchDelegate and the
respective unittests away from URLFetcher.

Bug: 773295,872875
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Ifd2f3afd0db3ceaf75f6a8f972259c656ec7db69
Reviewed-on: https://chromium-review.googlesource.com/1221729
Commit-Queue: Donn Denman <donnd@chromium.org>
Reviewed-by: Donn Denman <donnd@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594025}