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ToolbarAssistiveKeyboardDelegate was implemented by the
WebToolbarController. This CL moves the implementation to a separate
object. It will allow the implementation to be moved to the omnibox
folder once it is refactored.

Bug: 784785
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I94c0fde654fe7b84332226f5d2d2827ade248651
Reviewed-on: https://chromium-review.googlesource.com/768735Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#517372}