Remove last usage functions from HostContentSettingsMap and clean up prefs

device/geolocation/geolocation_service_context.h

Index: device/geolocation/geolocation_service_context.h
diff --git a/device/geolocation/geolocation_service_context.h b/device/geolocation/geolocation_service_context.h
index b462dc2cdc7ee35a3649c17be06f9a9d17f6b92f..e244d1f6847934e13c98d6ad10a4483ba7345532 100644
--- a/device/geolocation/geolocation_service_context.h
+++ b/device/geolocation/geolocation_service_context.h
@@ -24,10 +24,7 @@ class DEVICE_GEOLOCATION_EXPORT GeolocationServiceContext {
   virtual ~GeolocationServiceContext();
 
   // Creates a GeolocationServiceImpl that is weakly bound to |request|.
-  // |update_callback| will be called when services send
-  // location updates to their clients.
-  void CreateService(const base::Closure& update_callback,
-                     mojo::InterfaceRequest<mojom::GeolocationService> request);
+  void CreateService(mojo::InterfaceRequest<mojom::GeolocationService> request);
 
   // Called when a service has a connection error. After this call, it is no
   // longer safe to access |service|.