--- a/dom/animation/KeyframeUtils.cpp
+++ b/dom/animation/KeyframeUtils.cpp
@@ -378,18 +378,17 @@ HasValidOffsets(const nsTArray<Keyframe>
 
 static void
 MarkAsComputeValuesFailureKey(PropertyValuePair& aPair);
 
 static bool
 IsComputeValuesFailureKey(const PropertyValuePair& aPair);
 
 static void
-BuildSegmentsFromValueEntries(nsStyleContext* aStyleContext,
-                              nsTArray<KeyframeValueEntry>& aEntries,
+BuildSegmentsFromValueEntries(nsTArray<KeyframeValueEntry>& aEntries,
                               nsTArray<AnimationProperty>& aResult);
 
 static void
 GetKeyframeListFromPropertyIndexedKeyframe(JSContext* aCx,
                                            nsIDocument* aDocument,
                                            JS::Handle<JS::Value> aValue,
                                            nsTArray<Keyframe>& aResult,
                                            ErrorResult& aRv);
@@ -662,17 +661,17 @@ KeyframeUtils::GetAnimationPropertiesFro
       entry->mOffset = frame.mComputedOffset;
       entry->mProperty = value.mProperty;
       entry->mValue = value.mValue;
       entry->mTimingFunction = frame.mTimingFunction;
     }
   }
 
   nsTArray<AnimationProperty> result;
-  BuildSegmentsFromValueEntries(aStyleContext, entries, result);
+  BuildSegmentsFromValueEntries(entries, result);
   return result;
 }
 
 /* static */ bool
 KeyframeUtils::IsAnimatableProperty(nsCSSPropertyID aProperty)
 {
   if (aProperty == eCSSProperty_UNKNOWN) {
     return false;
@@ -1074,18 +1073,17 @@ IsComputeValuesFailureKey(const Property
            eCSSPropertyExtra_no_properties;
 }
 
 /**
  * Builds an array of AnimationProperty objects to represent the keyframe
  * animation segments in aEntries.
  */
 static void
-BuildSegmentsFromValueEntries(nsStyleContext* aStyleContext,
-                              nsTArray<KeyframeValueEntry>& aEntries,
+BuildSegmentsFromValueEntries(nsTArray<KeyframeValueEntry>& aEntries,
                               nsTArray<AnimationProperty>& aResult)
 {
   if (aEntries.IsEmpty()) {
     return;
   }
 
   // Sort the KeyframeValueEntry objects so that all entries for a given
   // property are together, and the entries are sorted by offset otherwise.