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This layers the Settings page's main contents above the toolbar such
that the main content is interactable no matter how far the toolbar's
text overlaps the main content.

Bug: 995686
Change-Id: Id8e244a47a13f19c13b47ce86e8b44afc6255524
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1762062Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Commit-Queue: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688665}