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This CL makes MIX-DL blocking check the appropriate site setting for
permitting mixed content. This allows controlling MIX-DL blocking with
the "Insecure content" site setting, which can be set with the
InsecureContentAllowedForUrls group policy.

Bug: 1041695
Change-Id: I6e20ddc827a4034259ea6790965232af860c2292
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036639Reviewed-by: Xing Liu <xingliu@chromium.org>
Reviewed-by: Carlos IL <carlosil@chromium.org>
Commit-Queue: Joe DeBlasio <jdeblasio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738597}