Revert "Do NOT MERGE Fix magnification border includes taskbar"

Revert submission 16003793-magnification_border

Bug: 196510717
Reason for revert: Caused NexusLauncherTests and NexusLauncherOutOfProcTests to stop running
Reverted Changes:
Ibbc9c51ea:Do NOT MERGE Fix magnification border includes tas...
Ida2bb5bf1:DO NOT MERGE Fix the cutout of magnification borde...

Change-Id: Id61a370271f94b4a379709226a90e29bc5dfa4b3