[librsvg: 2/3] Remove unused function

[Marge Bot <marge-bot src gnome org>]

commit 1b93deae5702af467ecb1b603482363d78aecfe0
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Nov 11 13:53:10 2021 -0600

    Remove unused function
    
    Part-of: <https://gitlab.gnome.org/GNOME/librsvg/-/merge_requests/629>

 src/filter.rs | 4 ----
 1 file changed, 4 deletions(-)
---
diff --git a/src/filter.rs b/src/filter.rs
index 48db7335d..97e2600bc 100644
--- a/src/filter.rs
+++ b/src/filter.rs
@@ -53,10 +53,6 @@ impl Filter {
         self.filter_units
     }
 
-    pub fn get_primitive_units(&self) -> CoordUnits {
-        self.primitive_units
-    }
-
     pub fn to_user_space(&self, params: &NormalizeParams) -> UserSpaceFilter {
         let x = self.x.to_user(params);
         let y = self.y.to_user(params);