Fixup for https://phabricator.services.mozilla.com/D284297

Signed-off-by: Oriol Brufau <obrufau@igalia.com>

Author: Loirooriol

style/values/specified/image.rs

@@ -1291,7 +1291,12 @@ impl PaintWorklet {
             .try_parse(|input| {
                 input.expect_comma()?;
                 input.parse_comma_separated(|input| {
-                    SpecifiedValue::parse(input, &context.url_data).map(Arc::new)
+                    SpecifiedValue::parse(
+                        input,
+                        Some(&context.namespaces.prefixes),
+                        &context.url_data,
+                    )
+                    .map(Arc::new)
                 })
             })
             .unwrap_or_default();