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Some users have their DSE set to an autogenerated TemplateURL created
as the user browses (via OpenSearch).

Those engines are automatically deleted when the corresponding History
entry is deleted.

This code protects those DSEs from removal. This was part of the
CanReplace() clause in M88 and before, so we regressed this in M89.

This CL fixes the regression and adds a test to prevent future
regression.

BUG=1166372

Change-Id: I448d053b7dcfc38343f2d82e5c86df8c5e168d66
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2628045
Commit-Queue: Tommy Li <tommycli@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Orin Jaworski <orinj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843400}