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This CL adds a toolbar with a "delete" item in the
SettingsRootTableViewController, displayed when the item selection is
not nil.

Bug: 894791
Change-Id: Ifffc2b774ab96bad97814cdf80829f2f0b74d77a
Reviewed-on: https://chromium-review.googlesource.com/c/1331469
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607534}