Revert of Fix shelf dimming on secondary display

Revert of Fix shelf dimming on secondary display (patchset #1 id:40001 of https://codereview.chromium.org/850833004/)

Reason for revert:
Causing crbug.com/451804 - probably using an invalid window

Original issue's description:
> Fix shelf dimming on secondary display
>
> BUG=449863
> TEST=ShelfLayoutManagerTest.DimmingBehaviorDualDisplay
>
> Committed: https://crrev.com/665d66d93fe22a50ba3623397b596a394098faef
> Cr-Commit-Position: refs/heads/master@{#312244}

TBR=skuhne@chromium.org,pkotwicz@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=449863
Committed: https://crrev.com/d9f6557e6515dd693acc620afdb87849a0f03c97
Cr-Commit-Position: refs/heads/master@{#313787}

[achaulk, 2015-01-29 17:27:41]

Created Revert of Fix shelf dimming on secondary display

[achaulk, 2015-01-29 17:28:12]

achaulk@chromium.org changed reviewers:
+ djkurtz@chromium.org

[achaulk, 2015-01-29 17:28:49]

not a committer so i need an lgtm from somebody

[pkotwicz, 2015-01-29 20:58:59]

The CQ bit was checked by pkotwicz@chromium.org

[pkotwicz, 2015-01-29 20:58:59]

lgtm

[commit-bot: I haz the power, 2015-01-29 21:00:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/883063003/1

[commit-bot: I haz the power, 2015-01-29 21:01:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-29 21:02:33]

Patchset 1 (id:??) landed as
https://crrev.com/d9f6557e6515dd693acc620afdb87849a0f03c97
Cr-Commit-Position: refs/heads/master@{#313787}

[Mr4D (OOO till 08-26), 2015-01-29 21:43:46]

lgtm