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This reverts commit 1fd2f73e.

Reason for revert:
This CL causes a compile failure.
The failure log is:
https://build.chromium.org/p/chromium/builders/Win/builds/56026

c:\b\c\b\win_archive\src\ui\keyboard\keyboard_test_util.cc(54): warning C4373: '`anonymous-namespace'::ControllerStateChangeWaiter::OnStateChanged': virtual function overrides 'keyboard::KeyboardControllerObserver::OnStateChanged', previous versions of the compiler did not override when parameters only differed by const/volatile qualifiers
c:\b\c\b\win_archive\src\ui\keyboard\keyboard_controller_observer.h(34): note: see declaration of 'keyboard::KeyboardControllerObserver::OnStateChanged'

Original change's description:
> Introduce explicit state to keyboard_controller.
> 
> Bug: 719905
> Change-Id: I14a1ee6b8e66c4f4c98ea4957dde7a7e0d75aad3
> Reviewed-on: https://chromium-review.googlesource.com/516866
> Commit-Queue: Keigo Oka <oka@chromium.org>
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Reviewed-by: Yuichiro Hanada <yhanada@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#478568}

TBR=oshima@chromium.org,bshe@chromium.org,oka@chromium.org,yhanada@chromium.org
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 719905

Change-Id: I14143cde82fa85757be72ee9aed622577fd40dd7
Reviewed-on: https://chromium-review.googlesource.com/530732Reviewed-by: Taiju Tsuiki <tzik@chromium.org>
Commit-Queue: Taiju Tsuiki <tzik@chromium.org>
Cr-Commit-Position: refs/heads/master@{#478572}