Revert of Fix OSK to show when physical keyboard is detached on KK

Revert of Fix OSK to show when physical keyboard is detached on KK (patchset #3 id:40001 of https://codereview.chromium.org/1322793002/ )

Reason for revert:
Causes http://crbug.com/534666, and the real fix https://codereview.chromium.org/1362603002 seems like it probably won't land before 47 branch point.  Revert this for now to make 47 match 46.

Original issue's description:
> Fix OSK to show when physical keyboard is detached on KK
>
> On KK, the same object is passed and we do not detect keyboard
> change correctly.
>
> BUG=500662
>
> Committed: https://crrev.com/85255cdcd8787a564e117ebd4991ce1975659b69
> Cr-Commit-Position: refs/heads/master@{#346810}

TBR=jdduke@chromium.org,yfriedman@chromium.org,changwan@chromium.org
NOTRY=true
BUG=500662, 534666
Committed: https://crrev.com/74beb97572b4b2cd1642a7e55098c82729e7204c
Cr-Commit-Position: refs/heads/master@{#351913}

[aelias_OOO_until_Jul13, 2015-10-01 22:31:52]

Created Revert of Fix OSK to show when physical keyboard is detached on KK

[aelias_OOO_until_Jul13, 2015-10-01 22:32:25]

The CQ bit was checked by aelias@chromium.org

[aelias_OOO_until_Jul13, 2015-10-01 22:32:34]

The CQ bit was unchecked by aelias@chromium.org

[aelias_OOO_until_Jul13, 2015-10-01 22:32:53]

The CQ bit was checked by aelias@chromium.org

[commit-bot: I haz the power, 2015-10-01 22:33:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1377103004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1377103004/1

[commit-bot: I haz the power, 2015-10-01 22:42:49]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-10-01 22:42:49]

Try jobs failed on following builders:
  win8_chromium_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win8_chromium_ng/...)

[aelias_OOO_until_Jul13, 2015-10-01 22:57:56]

The CQ bit was checked by aelias@chromium.org

[commit-bot: I haz the power, 2015-10-01 22:58:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1377103004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1377103004/1

[commit-bot: I haz the power, 2015-10-01 23:04:53]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-01 23:05:28]

Patchset 1 (id:??) landed as
https://crrev.com/74beb97572b4b2cd1642a7e55098c82729e7204c
Cr-Commit-Position: refs/heads/master@{#351913}