Migrate OpenInController to SimpleURLLoader

URLFetcher will stop working with advent of Network Service, and
SimpleURLLoader is the replacement API for most clients.
This CL migrates iOS' OpenInController.

Additionally, the CL also fixes the unittest TestDisplayOpenInMenu
that was flagged as DISABLED.

BUG=773295

Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I130b80cc7854d95266fba45b94df0caa40f89eda
Reviewed-on: https://chromium-review.googlesource.com/1239373
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#593938}
5 files changed