Revert 149869 because it broke ash_unittests on win_aura and linux_chromeos.

Revert 149869 because it broke ash_unittests on win_aura and linux_chromeos.

"""
2nd display should show the same background as login/lock screen:

Added special container for background on lock screen.
Background view can now be created in specific container.
Disabled lock screen wallpaper implementation based on serving PNG image via data source.

BUG=136853, 137581
TEST=Lock screen on multimonitor configuration. Check that windows on secondary display are hidden with background.

Review URL: https://chromiumcodereview.appspot.com/10810039

TBR=antrim@chromium.org
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=149878

[Nikita (slow), 2012-08-03 20:51:25]

Please include links to buildbot builds next time.