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The Content Security Policies code under services/network and the
relative mojo types still misses support for a few CSP directives. We
need to support all CSP directives in order to use it as a replacement
to the Blink types, and also if we want to add Content Security
Policies to the Policy Container (see attached bugs).

This CL implements support for the directive
'require-trusted-types-for'.

Bug: 1021462,1149272
Change-Id: I32880e8b3e35f1db4acf92a40e5d167a5f76870a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2539906Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Commit-Queue: Antonio Sartori <antoniosartori@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828637}