Return a valid but empty response if ItemSuggest returns no items. The existing JSON conversion method in ItemSuggestCache returns base::nullopt if there are no items in the response, which is then interpreted as kJsonConversionFailure in the metrics. This CL changes the behaviour to return empty Results instead, which will be interpreted as kNoResultsInResponse for metrics. There should not be any other effect. Bug: 1234550 Change-Id: Ic55e1f574c71765408e4f7a2f694f9c05893ff45 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3066781 Reviewed-by: Amanda Deacon <amandadeacon@chromium.org> Commit-Queue: Rachel Wong <wrong@chromium.org> Cr-Commit-Position: refs/heads/master@{#908351}
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