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This change updates the BrowserTestNonsecureURLRequest set up code to
use a URLLoaderInterceptor to handle URL requests. Using
URLLoaderInterceptor enables the test to work properly when using
Network Service code.

Bug: 778860
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: I5898b166967bd8d54608b78444c0aa7c99429df5
Reviewed-on: https://chromium-review.googlesource.com/1150826
Commit-Queue: Ovidio Henriquez <odejesush@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Chong Zhang <chongz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579811}