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Use the NavigationURLLoaderNetworkService when NavigationMojoResponse is
enabled, even if the network service isn’t.

The feature NavigationMojoResponse is currently disabled by default, so
this patch shouldn't introduce any new regression.

See the others CLs in this series:
[1/3] https://chromium-review.googlesource.com/c/739502
[2/3] this CL.
[3/3] https://chromium-review.googlesource.com/c/753738

This is part 2 of the implementation plan.
Design doc: https://goo.gl/Rrrc7n

Bug: 705744
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo;master.tryserver.chromium.linux:linux_site_isolation
Change-Id: Ia95527dce4be7b43747fec09ffe61bc51b2195a6
Reviewed-on: https://chromium-review.googlesource.com/741237
Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523373}