[librsvg] Remove unused function

[Federico Mena Quintero <federico src gnome org>]

commit c5f3175ae35ff9571067e716a5647a662befd886
Author: Federico Mena Quintero <federico gnome org>
Date:   Thu Sep 20 18:50:12 2018 -0500

    Remove unused function

 rsvg_internals/src/filters/context.rs | 6 ------
 1 file changed, 6 deletions(-)
---
diff --git a/rsvg_internals/src/filters/context.rs b/rsvg_internals/src/filters/context.rs
index e5023219..905aa38a 100644
--- a/rsvg_internals/src/filters/context.rs
+++ b/rsvg_internals/src/filters/context.rs
@@ -265,12 +265,6 @@ impl FilterContext {
         }
     }
 
-    /// Returns the <filter> node for this context.
-    #[inline]
-    pub fn get_filter_node(&self) -> RsvgNode {
-        self.node.clone()
-    }
-
     /// Returns the node that referenced this filter.
     #[inline]
     pub fn get_node_being_filtered(&self) -> RsvgNode {