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This CL only moves the logic from the coordinator to the mediator. It
shouldn't change any behavior. And it only moves logic related to the
manual fill view controller.

Bug: 845472
Change-Id: Id17a14903c50fa63a4a643025ef235256bc2474e
Reviewed-on: https://chromium-review.googlesource.com/c/1352185Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612130}