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This patch adds a title to the terms checkbox using the same style as
the payment request section titles.

R=arbesser@google.com, twellington@chromium.org

Bug: 806868
Change-Id: Ia13f80491ad062dcdc1e84d4dcd0cd7fb504cf63
Reviewed-on: https://chromium-review.googlesource.com/c/1340314
Commit-Queue: Mathias Carlen <mcarlen@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609246}