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Network Service: Add VariationsHttpHeadersBrowserTest.TestStrippingHeadersFromRequestUsingSimpleURLLoader

This CL adds variations http headers browser which uses
SimpleURLLoader.

Bug: 841309
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: I16bc257c18b76f0b2ba6b9ba721b87f4e3fb44a7
Reviewed-on: https://chromium-review.googlesource.com/1100106
Commit-Queue: Jun Cai <juncai@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568110}