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On mobile this will launch a (slightly delayed) request, iff the seed hasn't been refreshed in the past 5 hours. On desktop this will use the currently existing method on desktop, which does not do that check.

BUG=321379

Review URL: https://codereview.chromium.org/147723010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251532 0039d316-1c4b-4281-b951-d872f2087c98