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This reverts commit 4ba80e19.

Reason for revert: crashes in content::AncestorThrottle::ProcessResponseImpl are in top 5 crashes on multiple platforms

Original change's description:
> CSP: Enable out of blink enforcement of frame-ancestors.
> 
> Bug: 1032139
> Change-Id: Iac59a5e6c8452da0cf7e7ebc549a10d8970cc8c4
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1988684
> Reviewed-by: Nasko Oskov <nasko@chromium.org>
> Reviewed-by: John Abd-El-Malek <jam@chromium.org>
> Commit-Queue: Lucas Gadani <lfg@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#729823}

TBR=nasko@chromium.org,jam@chromium.org,lfg@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1032139,1041133
Change-Id: Id8eb28a5f2b6fc82ae94e0abb6f6d3c965bc6937
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003553Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#732446}