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This CL adds a footer to cookies settings, explaining to the user
how to apply the new cookies setting.

Bug: 1063824
Change-Id: Ib683b385115f30f6b46eceb7a30741ca0a0a99d9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2248563
Commit-Queue: Ewann Pellé <ewannpv@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779764}