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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

Review URL: https://codereview.chromium.org/883063003

Cr-Commit-Position: refs/heads/master@{#313787}