Bug 1068388 - Part 1: clarify that Stumbler pref is Android-only. r=nalexander,garvank
Bug 1068388 - Part 2: remove use of app.geo.reportdata from gecko. r=rnewman
Bug 1068388 - Part 4: update UI pref key value for app.geo.reportdata. r=rnewman
Bug 1068388 - Part 3: hide stumbler settings items if stumbler isn't built. r=garvank