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This reverts commit 959cddb1.

Reason for revert: The just enabled testKeyboardHideState test keeps failing:
https://ci.chromium.org/p/chromium/builders/try/ios-simulator/403589
https://ci.chromium.org/p/chromium/builders/try/ios-simulator/403581

Original change's description:
> [iOS][MF][EG2] Migrate keyboard observer test
> 
> 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}

TBR=eugenebut@chromium.org,stkhapugin@chromium.org,javierrobles@chromium.org

Change-Id: I40a1bfece2a1b3eb03aec11d58c1ab0496b420d9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1885252Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710050}