Revert "Merge "Freeze screen while changing expanded desktop mode." into cm-10.2"

This reverts commit 3e29dd1d56acad04a62c91b94bc5374b3a2d827a.

Conflicts:
	core/java/android/view/WindowManagerPolicy.java

Change-Id: Ib58b7010d2ddba44d9a8127159cc4ac63d44504f