--- a/layout/style/StyleAnimationValue.cpp
+++ b/layout/style/StyleAnimationValue.cpp
@@ -3034,17 +3034,16 @@ BuildStyleRule(nsCSSPropertyID aProperty
 
   RefPtr<css::StyleRule> rule = new css::StyleRule(nullptr, declaration, 0, 0);
   return rule.forget();
 }
 
 static bool
 ComputeValuesFromStyleRule(nsCSSPropertyID aProperty,
                            CSSEnabledState aEnabledState,
-                           dom::Element* aTargetElement,
                            nsStyleContext* aStyleContext,
                            css::StyleRule* aStyleRule,
                            nsTArray<PropertyStyleAnimationValuePair>& aValues,
                            bool* aIsContextSensitive)
 {
   MOZ_ASSERT(aStyleContext);
   if (!nsCSSProps::IsEnabled(aProperty, aEnabledState)) {
     return false;
@@ -3155,17 +3154,17 @@ StyleAnimationValue::ComputeValue(nsCSSP
       *aIsContextSensitive = false;
     }
     return true;
   }
 
   AutoTArray<PropertyStyleAnimationValuePair,1> values;
   bool ok = ComputeValuesFromStyleRule(aProperty,
                                        CSSEnabledState::eIgnoreEnabledState,
-                                       aTargetElement, aStyleContext, styleRule,
+                                       aStyleContext, styleRule,
                                        values, aIsContextSensitive);
   if (!ok) {
     return false;
   }
 
   MOZ_ASSERT(values.Length() == 1);
   MOZ_ASSERT(values[0].mProperty == aProperty);
 
@@ -3192,17 +3191,17 @@ ComputeValuesFromSpecifiedValue(
   // and Principal.
   RefPtr<css::StyleRule> styleRule =
     BuildStyleRule(aProperty, aTargetElement, aSpecifiedValue, aUseSVGMode);
   if (!styleRule) {
     return false;
   }
 
   aResult.Clear();
-  return ComputeValuesFromStyleRule(aProperty, aEnabledState, aTargetElement,
+  return ComputeValuesFromStyleRule(aProperty, aEnabledState,
                                     aStyleContext, styleRule, aResult,
                                     /* aIsContextSensitive */ nullptr);
 }
 
 /* static */ bool
 StyleAnimationValue::ComputeValues(
     nsCSSPropertyID aProperty,
     CSSEnabledState aEnabledState,