Clean up lockscreen target configuration code (1/2)

Get rid of a lot of duplicated code.

Change-Id: I80fb0b0cd9b5f7d79a5760f8fa6ae338d9ca7205
Bye, bye Talk. Welcome Hangouts (1/2)

Patchset  #2: Vector icons.

Change-Id: Ifa61061922c24f3ee08f2d51ff8f52ae45d921b7