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This CL moves the ownership of the OmniboxPopupViewIOS to the
OmniboxPopupCoordinator.
The coordinator is now owned by the toolbar, where the popup view was
previous owned.
It also changes the PopupView so it communicates with the mediator and
has now no knowledge of the coordinator.

Bug: 788640
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I530562cc0e52ed8ede575fc689a5326faf978e81
Reviewed-on: https://chromium-review.googlesource.com/833878
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#525338}