Network Service: Add VariationsHttpHeadersBrowserTest.TestStrippingHeadersFromSubresourceRequest

This CL adds variations http headers browser test from subresources.

Bug: 841309
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I41c07393d6ba1e214bceb6b8e3ffa31c503d377f
Reviewed-on: https://chromium-review.googlesource.com/1096299
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Jun Cai <juncai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566479}
2 files changed