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Also doing the same for kEasyUnlockLearnMoreUrl, which is only used in CrOS.

Bug: 621723
Change-Id: Ieada2f363c886e9321016de45a2157a3d35ac1fb
Reviewed-on: https://chromium-review.googlesource.com/1053155
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557728}