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To use SetManifestRequestFilter, need to move it to chromeos/components
to avoid circular dependencies. This affects os_settings that was also
using the function.

Also adds the strings that will be used for additional search queries.

Bug: b/149720483
Change-Id: Id1fe34dbb6a463963522bd256d0ccfa3366d1e05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2062116Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Commit-Queue: Rachel Carpenter <carpenterr@google.com>
Cr-Commit-Position: refs/heads/master@{#744414}