Move all geofencing code into its own module separate from geolocation.

Source/modules/geofencing/WorkerNavigatorGeofencing.idl

Index: Source/modules/geofencing/WorkerNavigatorGeofencing.idl
diff --git a/Source/modules/geolocation/GeofencingRegion.idl b/Source/modules/geofencing/WorkerNavigatorGeofencing.idl
similarity index 64%
rename from Source/modules/geolocation/GeofencingRegion.idl
rename to Source/modules/geofencing/WorkerNavigatorGeofencing.idl
index 4e22058d98b22fb2f0a7d196263ea4b9a458feab..853e234d8159d395eddf63090794454350df7fec 100644
--- a/Source/modules/geolocation/GeofencingRegion.idl
+++ b/Source/modules/geofencing/WorkerNavigatorGeofencing.idl
@@ -4,8 +4,7 @@
 
 [
     RuntimeEnabled=Geofencing,
-    NoInterfaceObject,
-    GarbageCollected,
-] interface GeofencingRegion {
-    readonly attribute DOMString id;
+    Exposed=ServiceWorker,
+] partial interface WorkerNavigator {
+    readonly attribute Geofencing geofencing;
 };