CSSValue Immediates: Replace CSSValue usage with const references

Source/core/page/PageSerializer.cpp

 /*
  * Copyright (C) 2011 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 503 matching lines @@
 void PageSerializer::retrieveResourcesForProperties(const StylePropertySet* styleDeclaration, Document& document)
 {
     if (!styleDeclaration)
         return;
 
     // The background-image and list-style-image (for ul or ol) are the CSS properties
     // that make use of images. We iterate to make sure we include any other
     // image properties there might be.
     unsigned propertyCount = styleDeclaration->propertyCount();
     for (unsigned i = 0; i < propertyCount; ++i) {
-        CSSValue cssValue = styleDeclaration->propertyAt(i).value();
+        const CSSValue& cssValue = styleDeclaration->propertyAt(i).value();
         retrieveResourcesForCSSValue(cssValue, document);
     }
 }
 
-void PageSerializer::retrieveResourcesForCSSValue(CSSValue cssValue, Document& document)
+void PageSerializer::retrieveResourcesForCSSValue(const CSSValue& cssValue, Document& document)
 {
     if (cssValue.isImageValue()) {
         CSSImageValue& imageValue = toCSSImageValue(cssValue);
         StyleImage* styleImage = imageValue.cachedOrPendingImage();
         // Non cached-images are just place-holders and do not contain data.
         if (!styleImage || !styleImage->isImageResource())
             return;
 
         addImageToResources(styleImage->cachedImage(), nullptr, styleImage->cachedImage()->url());
     } else if (cssValue.isFontFaceSrcValue()) {
@@ skipping 31 matching lines @@
 
     return fakeURL;
 }
 
 PageSerializer::Delegate* PageSerializer::delegate()
 {
     return m_delegate.get();
 }
 
 } // namespace blink