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This CL splits the use of the legacy method of the
LegacyToolbarCoordinator and regroup them in a specific protocol.
It allows a clearer interface description of the toolbar.

Bug: 798418
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: Ibde8c9e2a819be056de801ff6560922b22ec59d3
Reviewed-on: https://chromium-review.googlesource.com/848855Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526991}