[MD settings] clossure build fix for delayedSearchMetric_
[MD settings] clossure build fix for delayedSearchMetric_

This CL fixes a bad type entry for delayedSearchMetric.

BUG=None

Review URL: https://codereview.chromium.org/1580633002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#368786}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk