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The header should be set for all requests originating from
nostate-prefetch, main resource, all redirects and all subresources.

Using base::BindRepeating in new tests because of presubmit
warning, also switched similar tests to it for consistency.

Bug: 796855
Change-Id: I90614fac595f2dbc087a6ac99f54e2fc7d37f89a
Reviewed-on: https://chromium-review.googlesource.com/1104692
Commit-Queue: Egor Pasko <pasko@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Matthew Cary <mattcary@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568409}