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Add a unit test to ensure that if RESOURCE_TYPE_PREFETCH is specified in content::ResourceRequest, it's translated into the proper net:: flag on URLRequest.

The test is for the network service case. The old navigation code path has this covered already in RequestDataResourceDispatcherHostBrowserTest.LinkRelPrefetch.

The motivation is to convert a few prefetch browser tests from checking the URLLRequest object (which won't work with network service) to instead look at the ResourceRequest object.

Also de-duplicate BuildLoadFlagsForRequest.

BUG=776589

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I29a66944d17a7e99b2bacbcb0766fa1b1174bd57
Reviewed-on: https://chromium-review.googlesource.com/797926Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520594}