Removed the non-const version of PropertyReference::value()

third_party/WebKit/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 73 matching lines @@
         RefPtr<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 792 matching lines @@
 }
 
 DEFINE_TRACE(CSSAnimations)
 {
     visitor->trace(m_transitions);
     visitor->trace(m_pendingUpdate);
     visitor->trace(m_runningAnimations);
 }
 
 } // namespace blink