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Suggestions containing an action url should launch the url in the
browser. Otherwise we continue to use the suggestion text to submit
a simple query.

See bug for before/after demo.

Bug: b:79597028
Change-Id: I73b02c22e3fbdcef70f20a35100116ebd77261e9
Reviewed-on: https://chromium-review.googlesource.com/1056226Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#558456}