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Heavily based on an original CL by Charles Vazac <cvazac@akamai.com>
at https://chromium-review.googlesource.com/c/chromium/src/+/1396938

Service worker navigation preload[1] is a web platform feature that
involves sending a request to network at the same time as starting up
the service worker for a navigation. This network request was not
visible to extensions.

This CL:
- Modifies the network service path for service worker navigation
preload requests so that the embedder is aware of them.
- In web_request_permissions.cc, if a request is not considered a browser
side navigation, it becomes opaque to extensions. This CL makes it so
that service worker navigation preload requests[1] are exempted from
that.

This CL deletes the unit test for navigation preload in
ServiceWorkerNavigationLoaderTest. It was too much hassle getting that
to work with a TestWebContents because the infrastructure for enabling
NetworkService in content_unittests is not set up yet so
unittest_test_suite.cc typically disables NetworkService (issue 901092).
We have sufficient navigation preload test coverage in browser tests and
web tests.

[1] https://w3c.github.io/ServiceWorker/#navigationpreloadmanager

Bug: 914062
Change-Id: I4c91521e55c1103a1a67d973e595094b78357c34
Reviewed-on: https://chromium-review.googlesource.com/c/1491168Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Matt Falkenhagen <falken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636598}