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The naming convention is coordinator. The controller is the combination
of the coordinator and mediator.

Change-Id: I80346b7a606cd5e2d86dee0f6d8ef2594a62cbda
Reviewed-on: https://chromium-review.googlesource.com/1103386
Commit-Queue: Pedro Amaral <amaralp@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568273}