GitLab

This CL moves proxy_browsertest.cc away from URLFetcher, replacing it by
SimpleURLLoader.

Bug: 844915
Change-Id: Id0fd3ec4168f8b1c272906e6620c11b5418d2f54
Reviewed-on: https://chromium-review.googlesource.com/1141948
Commit-Queue: Sergio Villar <svillar@igalia.com>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#576413}