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As part of the effort to bring the new Network Service online, we are
deprecating URLFetcher in favor of SimpleURLLoader.

Background: https://docs.google.com/document/d/1YZDPeg3bf46QPU_vUotFwOEPHquww36b-UdRlO3ZpMU/edit

Bug: 844943
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I77ec8b2c4ff6a11995f3b6c2ec911c94b16789e4
Reviewed-on: https://chromium-review.googlesource.com/1076596
Commit-Queue: Mark Pilgrim <pilgrim@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562838}