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This moves logic for this case from ChromeNetworkDelegate to
NetworkContext's NetworkDelegate, and adds a Mojo parameter to cause
requests with bad referrers to fail (enabled by default).

Also removes the action Net.URLRequest_StartJob_InvalidReferrer rather
than moving it, as it was unowned.

Bug: 852871
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;luci.chromium.try:linux_mojo;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I9d6d55157ba28e2b12ca7136b78330100a8673aa
Reviewed-on: https://chromium-review.googlesource.com/1103119Reviewed-by: Gayane Petrosyan <gayane@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568807}