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Changing the ClientHintsBrowserTest browser tests to use
URLLoaderInterceptor. This fixes 2 tests with the network service.

Bug: 776589
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: Icfa0f2c26723de4a1c0f815411ab39e1b016d61d
Reviewed-on: https://chromium-review.googlesource.com/956753Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Jay Civelli <jcivelli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542238}