fix potential memory leak

use delete before return

Change-Id: I5449ad90bb6910f057bd825b722c9803a7343c34
SystemUI: always use transparent notification shade

Devices with less than 512MB of memory have a solid
black notification shade. Remove the isHighEndGfx()
check to force a transparent notification shade on
all devices.

Change-Id: I9a68a2a8b0d36685f8899f3bbed43bb6bccb47b1