CSSValue Immediates: Replace CSSPrimitiveValue usage with const references

Source/core/css/CSSComputedStyleDeclaration.cpp

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2011 Sencha, Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
@@ skipping 592 matching lines @@
     return getPropertyNameString(computableProperties()[i]);
 }
 
 bool CSSComputedStyleDeclaration::cssPropertyMatches(CSSPropertyID propertyID, const CSSValue propertyValue) const
 {
     if (propertyID == CSSPropertyFontSize && propertyValue.isPrimitiveValue() && m_node) {
         m_node->document().updateLayoutIgnorePendingStylesheets();
         const ComputedStyle* style = m_node->ensureComputedStyle(m_pseudoElementSpecifier);
         if (style && style->fontDescription().keywordSize()) {
             CSSValueID sizeValue = cssIdentifierForFontSizeKeyword(style->fontDescription().keywordSize());
-            const CSSPrimitiveValue primitiveValue = toCSSPrimitiveValue(propertyValue);
+            const CSSPrimitiveValue& primitiveValue = toCSSPrimitiveValue(propertyValue);
             if (primitiveValue.isValueID() && primitiveValue.getValueID() == sizeValue)
                 return true;
         }
     }
     NullableCSSValue value = getPropertyCSSValue(propertyID);
     return value && value->equals(propertyValue);
 }
 
 PassRefPtrWillBeRawPtr<MutableStylePropertySet> CSSComputedStyleDeclaration::copyProperties() const
 {
@@ skipping 68 matching lines @@
     exceptionState.throwDOMException(NoModificationAllowedError, "These styles are computed, and therefore the '" + getPropertyNameString(id) + "' property is read-only.");
 }
 
 DEFINE_TRACE(CSSComputedStyleDeclaration)
 {
     visitor->trace(m_node);
     CSSStyleDeclaration::trace(visitor);
 }
 
 } // namespace blink