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This CL adds a LocationBar to the ToolbarCoordinator. The
ToolbarCoordinator is the delegate for the LocationBar so it needs to
conforms to the LocationBarDelegate protocol.

Bug: 784911
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I1b7d2aa2c7813f5d50622594a8922beacb62e6f6
Reviewed-on: https://chromium-review.googlesource.com/771693
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517404}