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This reverts commit 79faeacd.

Reason for revert: broke linux-chromeos-dbg
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/linux-chromeos-dbg/9171

Original change's description:
> Add TestKeyboardControllerObserver for ash keyboard unit tests
> 
> This also includes some cleanup of the BUILD.gn files.
> 
> Currently TestKeyboardControllerObserver is only needed by
> AshKeyboardControllerUnitTests, but will be required by any tests
> affecting the keyboard with SingleProcessMash once enabled.
> 
> Bug: 843332
> Change-Id: I3c321cfaefe55bb61bb11f2232f524714f6453f5
> Reviewed-on: https://chromium-review.googlesource.com/c/1343524
> Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
> Reviewed-by: Scott Violet <sky@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#610881}

TBR=stevenjb@chromium.org,sky@chromium.org

Change-Id: Ib7827c5a036c84e4486cb4ce8c32fd94a9c8f14a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 843332
Reviewed-on: https://chromium-review.googlesource.com/c/1351453Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Commit-Queue: Chrome Cunningham <chcunningham@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610893}