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This reverts commit 1c92b3fd.

Reason for revert: crbug.com/1166551

Original change's description:
> Add custom message related fields to content analysis dialog
>
> Bug: 1166369
> Change-Id: I32459ec22d8a4a6bd57d8ae0a17a3850a365fc57
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625914
> Commit-Queue: anthonyvd <anthonyvd@chromium.org>
> Reviewed-by: Dominique Fauteux-Chapleau <domfc@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#843330}

TBR=anthonyvd@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com,domfc@chromium.org

Change-Id: Ibdb66dfcb4e267c61eefaaa48ac5a2aefdd8ba16
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1166369,1166551
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2628949
Commit-Queue: Andy Paicu <andypaicu@chromium.org>
Reviewed-by: Andy Paicu <andypaicu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843456}