[librsvg] filters: remove unused method

[Paolo Borelli <pborelli src gnome org>]

commit 2a53924fc85c17656db28e39f80bbe829eb955b5
Author: Paolo Borelli <pborelli gnome org>
Date:   Sat Dec 5 16:46:28 2020 +0100

    filters: remove unused method
    
    This is a duplicate of get_computed_values_from_node_being_filtered

 src/filters/context.rs | 4 ----
 1 file changed, 4 deletions(-)
---
diff --git a/src/filters/context.rs b/src/filters/context.rs
index e8717276..d83eee46 100644
--- a/src/filters/context.rs
+++ b/src/filters/context.rs
@@ -264,10 +264,6 @@ impl FilterContext {
         self.effects_region
     }
 
-    pub fn get_computed_from_node_being_filtered(&self) -> &ComputedValues {
-        &self.computed_from_node_being_filtered
-    }
-
     /// Retrieves the filter input surface according to the SVG rules.
     ///
     /// Does not take `processing_linear_rgb` into account.