Networking URL construction no longer adds /v2.0

Because it's already handled by the ResourceBase that's set up when you
acquire a client.
diff --git a/openstack/networking/v2/extensions/delegate.go b/openstack/networking/v2/extensions/delegate.go
index b6006ab..d08e1fd 100644
--- a/openstack/networking/v2/extensions/delegate.go
+++ b/openstack/networking/v2/extensions/delegate.go
@@ -29,22 +29,13 @@
 	return outer, nil
 }
 
-// rebased is a temporary workaround to isolate changes to this package. FIXME: set ResourceBase
-// in the NewNetworkV2 method and remove the version string from URL generation methods in
-// networking resources.
-func rebased(c *gophercloud.ServiceClient) *gophercloud.ServiceClient {
-	var r = *c
-	r.ResourceBase = c.Endpoint + "v2.0/"
-	return &r
-}
-
 // Get retrieves information for a specific extension using its alias.
 func Get(c *gophercloud.ServiceClient, alias string) GetResult {
-	return GetResult{common.Get(rebased(c), alias)}
+	return GetResult{common.Get(c, alias)}
 }
 
 // List returns a Pager which allows you to iterate over the full collection of extensions.
 // It does not accept query parameters.
 func List(c *gophercloud.ServiceClient) pagination.Pager {
-	return common.List(rebased(c))
+	return common.List(c)
 }