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This CL adds support for overriding the translate language blocklist and
the URL host blocklist (each behind separate flags) when a link is
clicked that has hrefTranslate set. Each of these flags also supports a
parameter to indicate how much behavior should override these
blocklists: just the behavior of showing the translate UI, or the
automatic translation behavior as well.

Bug: 1131240
Change-Id: I1b4912ed1e369b04f1d326255c1a77763d825c0b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2425085
Commit-Queue: Scott Little <sclittle@chromium.org>
Reviewed-by: Megan Jablonski <megjablon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812190}