Gets rid of the LocationArbitrator interface, in preference for LocationProvider.

blimp/engine/feature/geolocation/blimp_location_provider.cc

Index: blimp/engine/feature/geolocation/blimp_location_provider.cc
diff --git a/blimp/engine/feature/geolocation/blimp_location_provider.cc b/blimp/engine/feature/geolocation/blimp_location_provider.cc
index eed675f8b45460592e693de4fdb6e6407a642466..814153b42cc4ed3491d683240799a921a1d8de90 100644
--- a/blimp/engine/feature/geolocation/blimp_location_provider.cc
+++ b/blimp/engine/feature/geolocation/blimp_location_provider.cc
@@ -44,8 +44,8 @@ void BlimpLocationProvider::StopProvider() {
   }
 }
 
-void BlimpLocationProvider::GetPosition(device::Geoposition* position) {
-  *position = cached_position_;
+const device::Geoposition& BlimpLocationProvider::GetPosition() {
+  return cached_position_;
 }
 
 void BlimpLocationProvider::RequestRefresh() {