GitLab

Remove deprecate test that would require new code to be migrated.
Update and enable keyboard disappear test.
Create app interface to interact with a shared instance of the observer
in the app.
Remove OCMock usage in the test.

TBR=eugenebut@chromium.org

Change-Id: Iaa5384f241e63b95ee516d4666b2e2adf65b7da6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1881566
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Reviewed-by: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709939}