Make sure the event blocker is destroyed when we leave maximize mode.

Make sure the event blocker is destroyed when we leave maximize mode.

Turning off the internal display while an external one is connected will
enter the device into docked mode, and will exit the maximized mode (if any).
We need to make sure that the keyboard and touchpad events are re-enabled
when the maximize mode exits.

BUG=549803
TEST=ash_unittests --gtest_filter=MaximizeModeControllerTest.NoMaximizeModeWithDisabledInternalDisplay

Committed: https://crrev.com/bf0b91e43cd331c6ebdb80755a2a74bd71f259ab
Cr-Commit-Position: refs/heads/master@{#370436}

[afakhry, 2016-01-15 02:16:17]

afakhry@chromium.org changed reviewers:
+ flackr@chromium.org

[afakhry, 2016-01-15 02:16:18]

flackr@chromium.org: Could you please review? Thanks!

[afakhry, 2016-01-15 18:51:56]

afakhry@chromium.org changed reviewers:
+ varkha@chromium.org
- flackr@chromium.org

[afakhry, 2016-01-15 18:51:56]

flackr is OOO. varkha, could you please review?

[varkha, 2016-01-16 04:36:33]

lgtm

[afakhry, 2016-01-20 18:01:33]

The CQ bit was checked by afakhry@chromium.org

[commit-bot: I haz the power, 2016-01-20 18:03:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1588883005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1588883005/1

[commit-bot: I haz the power, 2016-01-20 18:44:27]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-20 18:45:41]

Description was changed from

==========
Make sure the event blocker is destroyed when we leave maximize mode.

Turning off the internal display while an external one is connected will
enter the device into docked mode, and will exit the maximized mode (if any).
We need to make sure that the keyboard and touchpad events are re-enabled
when the maximize mode exits.

BUG=549803
TEST=ash_unittests
--gtest_filter=MaximizeModeControllerTest.NoMaximizeModeWithDisabledInternalDisplay
==========

to

==========
Make sure the event blocker is destroyed when we leave maximize mode.

Turning off the internal display while an external one is connected will
enter the device into docked mode, and will exit the maximized mode (if any).
We need to make sure that the keyboard and touchpad events are re-enabled
when the maximize mode exits.

BUG=549803
TEST=ash_unittests
--gtest_filter=MaximizeModeControllerTest.NoMaximizeModeWithDisabledInternalDisplay

Committed: https://crrev.com/bf0b91e43cd331c6ebdb80755a2a74bd71f259ab
Cr-Commit-Position: refs/heads/master@{#370436}
==========

[commit-bot: I haz the power, 2016-01-20 18:45:41]

Patchset 1 (id:??) landed as
https://crrev.com/bf0b91e43cd331c6ebdb80755a2a74bd71f259ab
Cr-Commit-Position: refs/heads/master@{#370436}