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This CL fixes MoveContentBelowHeader to have it take into account the
bottom toolbar. This function now moves the content below the header but
also add an inset for the bottom toolbar.

Bug: 851129
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I2b7c5e54e1597bf2779e028381b9d05910c021c7
Reviewed-on: https://chromium-review.googlesource.com/1111845Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570697}