Merge "SupportLeanbackshowcase: clean up preference fragment code" into nyc-dev
am: 097514b34c

* commit '097514b34cd5e4c22df302cadef34d95159f869e':
  SupportLeanbackshowcase: clean up preference fragment code

Change-Id: Ie67a31332642a4ba9c80dd3b83e923c9d215d6c4