Remove last usage functions from HostContentSettingsMap and clean up prefs

device/geolocation/geolocation_service_impl.cc

Index: device/geolocation/geolocation_service_impl.cc
diff --git a/device/geolocation/geolocation_service_impl.cc b/device/geolocation/geolocation_service_impl.cc
index a56b6d83427325b8cc59bcf0556bcf4dca7b678f..357d9cd9fcf1b2bc383f492ccef6eea16c7349c9 100644
--- a/device/geolocation/geolocation_service_impl.cc
+++ b/device/geolocation/geolocation_service_impl.cc
@@ -60,11 +60,9 @@ void RecordGeopositionErrorCode(Geoposition::ErrorCode error_code) {
 
 GeolocationServiceImpl::GeolocationServiceImpl(
     mojo::InterfaceRequest<GeolocationService> request,
-    GeolocationServiceContext* context,
-    const base::Closure& update_callback)
+    GeolocationServiceContext* context)
     : binding_(this, std::move(request)),
       context_(context),
-      update_callback_(update_callback),
       high_accuracy_(false),
       has_position_to_report_(false) {
   DCHECK(context_);
@@ -160,8 +158,6 @@ void GeolocationServiceImpl::OnLocationUpdate(const Geoposition& position) {
   RecordGeopositionErrorCode(position.error_code);
   DCHECK(context_);
 
-  update_callback_.Run();
-
   current_position_.valid = position.Validate();
   current_position_.latitude = position.latitude;
   current_position_.longitude = position.longitude;