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The SimplerURLLoader API is compatible with the out-of-process network
service.

This is the only code that uses chunked uploads, and the new API for
that requires the consumer handle all the complexities of that, which
makes this CL much more complicated than most URLFetcher to
SimplerURLLoader conversions.

BUG:  810555

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_mojo;master.tryserver.chromium.linux:linux_vr
Change-Id: I4cc1f5f8710d08830062e95296ae5d814a6097e8
Reviewed-on: https://chromium-review.googlesource.com/1050825Reviewed-by: Biao She <bshe@chromium.org>
Reviewed-by: Tommi <tommi@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Doug Turner <dougt@chromium.org>
Reviewed-by: Max Morin <maxmorin@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565378}