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With this CL we store directives names in WebContentSecurityPolicy
using the enum network::mojom::CSPDirectiveName instead of using
strings. This small changes simplifies the type conversion
network::mojom::blink::ContentSecurityPolicy ->
WebContentSecurityPolicy -> network::mojom::ContentSecurityPolicy.

Bug: 1021462,1149272
Change-Id: I1a28f0be010ff054d3259d733e0fdc2651057d77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2607888Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Commit-Queue: Antonio Sartori <antoniosartori@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843521}