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This separates the WebContentsObserver and WebContentsDelegate code
from ChromeKeyboardUI.

Note: ChromeKeyboardWebContents has a dependency on ui::keyboard that
will need to be replaced with a mojo API call for multi process mash,
but the separation should at least help with the single process mash
split, and calls out / documents where the multi process mash change
needs to happen.

Bug: 843332
Change-Id: I09a8ea3ac0536737d395fda372b98919221c1a3a
Reviewed-on: https://chromium-review.googlesource.com/1182679Reviewed-by: Darren Shen <shend@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585146}