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Use AppGround to open "learn how" link.

Bug: 1045455
Change-Id: Ic9c8bb4c12a51804f2d95510d401777fa576da87
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2115543
Commit-Queue: David Jean <djean@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753546}