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I have checked that these tests "unexpectedly" pass in
https://test-results.appspot.com/data/layout_results/Linux_Tests/68204/site_per_process_webkit_layout_tests/layout-test-results/results.html:
(and also in 68203 and 68202 and 68201), so let's try reenabling these
tests.

I have also tried 5 runs on linux_chromium_rel_ng trybot and all the
removed tests have passed there as well, except
external/wpt/content-security-policy/securitypolicyviolation/upgrade-insecure-requests-reporting.https.html
which I can repro locally and which turned out to be the same as
https://crbug.com/793127.

Bug: 477150
Change-Id: I6b426a9ce0c9aa88f4c6945a2bec295acf9fc4da
Reviewed-on: https://chromium-review.googlesource.com/957343Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542289}