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We trust `devtools:` in the same way we trust `chrome:`. We should
consider these resources to be secure contexts, as this will enable
us to harden them with mechanisms like Trusted Types that are only
available in such contexts.

Bug: 1070526
Change-Id: I0ac60c642e1afd3f81d669d60a399a94ab0f0751
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2145882Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759163}