Screenshot: Add delete action through notification

* Forward port to lollipop.

Change-Id: I73d160766c232266f98badc1340b506e873c1ad5
Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>

(cherry picked from commit 4d111e8ed44bae54ef27e937af53bc6dddd11488)
SystemUI: Use material delete icon

Change-Id: I11df5713486672e4f5c4784e6f94a893cf36b4dd