Backed out changeset 27dc0066cd2 (Bug 873072) due to bug 896992. a=lsblakk
bug 898190 - fix test for bug 888172 to use a valid CSP policy for testing.  r=grobinson, a=lsblakk

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extra : rebase_source : 30fd5e958d996623c95d7dec80bdb4eb4c2a522e