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This change modifies tests in a way that test won't be blocked by
Trusted Types mitigation on WebUI. Also disabled Trusted Types
mitigations in some WebUI pages due to usage of Polymer.

Bug: 41905
Change-Id: I85c60066672e896032599d674b7bac35e38ccb7b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341800
Commit-Queue: Jun Kokatsu <Jun.Kokatsu@microsoft.com>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Aaron Colwell <acolwell@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797467}