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This is only used by one unit test, so move it out of content/test.

This is a follow-up to:
https://chromium-review.googlesource.com/c/chromium/src/+/2246957

Bug: 1094811
Change-Id: I5ecc0637514dca22055850d59c933c5380537710
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2250342
Auto-Submit: enne <enne@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779576}