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This change adds Trusted Type policy for parse_html_subset.js, so that
sanitization happens without a Trusted Types violation.

Bug: 41905
Change-Id: I545d1a7a28b22d56f5c4539a3c20923ab26d6d58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2215701
Commit-Queue: Jun Kokatsu <Jun.Kokatsu@microsoft.com>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#775252}