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Also change parse_html_subset.js to initialize the
parse-html-subset TrustedTypes policy lazily, only when it is
actually used, to avoid having to allow that policy in the CSP
configuration on the C++ side for cases where parse_html_subset.js
is just a transitive dependency and not actually used (which is
the case for chrome;//view-cert).

Bug: 1149868
Change-Id: I1a8f32f3289f6068c0eafbb80cdc046451fc028e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2544067
Commit-Queue: dpapad <dpapad@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830138}