GitLab

This CL removes RootWindowController::ActivateKeyboard and
DeactivatteKeyboard and replaces them with calls into
AshKeyboardController, simplifying the relationship.

Bug: 843332
Change-Id: I78cde4b9b22ba1c9406cbc44dc90af41d4ce37bb
Reviewed-on: https://chromium-review.googlesource.com/c/1294691
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602080}