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Convert AutocompleteCoordinator into an interface and move existing code
into AutocompleteCoordinatorImpl. Isolate its creation to
AutocompleteCoordinatorFactory.

Move several inner interfaces out as top-level interfaces. This allows
fewer intra-package imports, especially important for making the factory
as simple as possible.

Reduce visibility of test-only methods to package-private, and create
AutocompleteCoordinatorTestUtils for test support to access these test-
only methods.

Bug: 961368
Change-Id: I37e2f04e8fe1dd76fc754ee67d8ef504525d85ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1603093Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Auto-Submit: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662229}