Fix shelf dimming on secondary display

Fix shelf dimming on secondary display

BUG=449863
TEST=ShelfLayoutManagerTest.DimmingBehaviorDualDisplay

Committed: https://crrev.com/665d66d93fe22a50ba3623397b596a394098faef
Cr-Commit-Position: refs/heads/master@{#312244}

[pkotwicz, 2015-01-18 23:40:56]

pkotwicz@chromium.org changed reviewers:
+ skuhne@chromium.org

[pkotwicz, 2015-01-18 23:40:57]

skuhne@ PTAL

[pkotwicz, 2015-01-18 23:40:57]

pkotwicz@chromium.org changed reviewers:
+ skuhne@chromium.org

[pkotwicz, 2015-01-18 23:40:58]

skuhne@ PTAL

[pkotwicz, 2015-01-19 02:28:49]

Patchset #1 (id:1) has been deleted

[pkotwicz, 2015-01-19 02:31:09]

Patchset #1 (id:20001) has been deleted

[Mr4D (OOO till 08-26), 2015-01-20 16:14:30]

lgtm

[pkotwicz, 2015-01-20 18:36:53]

The CQ bit was checked by pkotwicz@chromium.org

[commit-bot: I haz the power, 2015-01-20 18:37:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/850833004/40001

[commit-bot: I haz the power, 2015-01-20 19:26:53]

Committed patchset #1 (id:40001)

[commit-bot: I haz the power, 2015-01-20 19:28:53]

Patchset 1 (id:??) landed as
https://crrev.com/665d66d93fe22a50ba3623397b596a394098faef
Cr-Commit-Position: refs/heads/master@{#312244}

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

A revert of this CL (patchset #1 id:40001) has been created in
https://codereview.chromium.org/883063003/ by achaulk@chromium.org.

The reason for reverting is: Causing crbug.com/451804 - probably using an
invalid window.