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Enable fetching of hints from the URLs extracted from the
search result page.
The hints are fetched only on slow connections.

Change-Id: I0c8d0324ff913297c9f2b2a5fdc300771c0c3798
Bug: 1004527
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1839240
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703480}