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This CL moves all the logic from the FormInputAccessoryViewController
that is not directly related to managing its view to a new mediator.
Creates a consumer for the communication the the view controller.
Updates tests to use this mediator instead.
Removes the dependency on the CRWWebViewProxy.

Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I1b0f6c595f069ea45e04c9dacdc4437dbfe9041a
Bug: 661622, 727716, 845472, 847408
Reviewed-on: https://chromium-review.googlesource.com/1130522Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582056}