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The current logic uses ResourceDispatcherHostDelegate.
This doesn't work when network service is enabled.
This CL rewrites the logic using ContentBrowserClient,
so test can work with and without network service enabled

BUG=715630

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I109a7f3fafe6a7d81a98ef39f2b828e7e0551cf0
Reviewed-on: https://chromium-review.googlesource.com/801370Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521047}