Simplify animation/transition parsing slightly

Source/core/animation/css/CSSAnimations.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 99 matching lines @@
         for (unsigned j = 0; j < properties.propertyCount(); j++) {
             specifiedPropertiesForUseCounter.add(properties.propertyAt(j).id());
             CSSPropertyID property = propertyForAnimation(properties.propertyAt(j).id());
             if (property == CSSPropertyWebkitAnimationTimingFunction || property == CSSPropertyAnimationTimingFunction) {
                 CSSValue* value = properties.propertyAt(j).value();
                 RefPtr<TimingFunction> timingFunction;
                 if (value->isInheritedValue() && parentStyle->animations())
                     timingFunction = parentStyle->animations()->timingFunctionList()[0];
                 else if (value->isInheritedValue() || value->isInitialValue())
                     timingFunction = CSSTimingData::initialTimingFunction();
-                else if (value->isValueList())
+                else
                     timingFunction = CSSToStyleMap::mapAnimationTimingFunction(toCSSValueList(value)->item(0));
-                else
-                    timingFunction = CSSToStyleMap::mapAnimationTimingFunction(value);
                 keyframe->setEasing(timingFunction.release());
             } else if (CSSAnimations::isAnimatableProperty(property)) {
                 keyframe->setPropertyValue(property, CSSAnimatableValueFactory::create(property, *keyframeStyle).get());
             }
         }
         keyframes.append(keyframe);
         // The last keyframe specified at a given offset is used.
         for (size_t j = 1; j < offsets.size(); ++j) {
             keyframes.append(toAnimatableValueKeyframe(keyframe->cloneWithOffset(offsets[j]).get()));
         }
@@ skipping 704 matching lines @@
 void CSSAnimationUpdate::trace(Visitor* visitor)
 {
     visitor->trace(m_newTransitions);
     visitor->trace(m_activeInterpolationsForAnimations);
     visitor->trace(m_activeInterpolationsForTransitions);
     visitor->trace(m_newAnimations);
     visitor->trace(m_cancelledAnimationPlayers);
 }
 
 } // namespace WebCore