Change CSSToStyleMap functions to take const CSSValue&s

third_party/WebKit/Source/core/animation/AnimationInputHelpers.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/animation/AnimationInputHelpers.h"
 
 #include "core/css/CSSValueList.h"
 #include "core/css/parser/CSSParser.h"
 #include "core/css/resolver/CSSToStyleMap.h"
@@ skipping 23 matching lines @@
         return nullptr;
 
     RefPtrWillBeRawPtr<CSSValue> value = CSSParser::parseSingleValue(CSSPropertyTransitionTimingFunction, string);
     if (!value || !value->isValueList()) {
         ASSERT(!value || value->isCSSWideKeyword());
         return nullptr;
     }
     CSSValueList* valueList = toCSSValueList(value.get());
     if (valueList->length() > 1)
         return nullptr;
-    return CSSToStyleMap::mapAnimationTimingFunction(valueList->item(0), true);
+    return CSSToStyleMap::mapAnimationTimingFunction(*valueList->item(0), true);
 }
 
 } // namespace blink