CSSValue Immediates: Replace CSSValue usage with const references

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 71 matching lines @@
         RefPtrWillBeRawPtr<StringKeyframe> keyframe = StringKeyframe::create();
         const Vector<double>& offsets = styleKeyframe->keys();
         ASSERT(!offsets.isEmpty());
         keyframe->setOffset(offsets[0]);
         keyframe->setEasing(defaultTimingFunction);
         const StylePropertySet& properties = styleKeyframe->properties();
         for (unsigned j = 0; j < properties.propertyCount(); j++) {
             CSSPropertyID property = properties.propertyAt(j).id();
             specifiedPropertiesForUseCounter.add(property);
             if (property == CSSPropertyAnimationTimingFunction) {
-                CSSValue value = properties.propertyAt(j).value();
+                const CSSValue& value = properties.propertyAt(j).value();
                 RefPtr<TimingFunction> timingFunction;
                 if (value.isInheritedValue() && parentStyle->animations()) {
                     timingFunction = parentStyle->animations()->timingFunctionList()[0];
                 } else if (value.isValueList()) {
                     timingFunction = CSSToStyleMap::mapAnimationTimingFunction(toCSSValueList(value).item(0));
                 } else {
                     ASSERT(value.isCSSWideKeyword());
                     timingFunction = CSSTimingData::initialTimingFunction();
                 }
                 keyframe->setEasing(timingFunction.release());
@@ skipping 699 matching lines @@
     visitor->trace(m_activeInterpolationsForAnimations);
     visitor->trace(m_activeInterpolationsForTransitions);
     visitor->trace(m_newAnimations);
     visitor->trace(m_suppressedAnimations);
     visitor->trace(m_animationsWithUpdates);
     visitor->trace(m_animationsWithStyleUpdates);
 #endif
 }
 
 } // namespace blink