Reduced the callers to the non-const version of CSSValueList::item()

third_party/WebKit/Source/core/css/CSSImageSetValue.cpp

 /*
  * Copyright (C) 2012 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 39 matching lines @@
 
 CSSImageSetValue::~CSSImageSetValue()
 {
 }
 
 void CSSImageSetValue::fillImageSet()
 {
     size_t length = this->length();
     size_t i = 0;
     while (i < length) {
-        CSSImageValue* imageValue = toCSSImageValue(item(i));
+        const CSSImageValue* imageValue = toCSSImageValue(item(i));
         String imageURL = imageValue->url();
 
         ++i;
         ASSERT_WITH_SECURITY_IMPLICATION(i < length);
-        CSSValue* scaleFactorValue = item(i);
+        const CSSValue* scaleFactorValue = item(i);
         float scaleFactor = toCSSPrimitiveValue(scaleFactorValue)->getFloatValue();
 
         ImageWithScale image;
         image.imageURL = imageURL;
         image.referrer = SecurityPolicy::generateReferrer(imageValue->referrer().referrerPolicy, KURL(ParsedURLString, imageURL), imageValue->referrer().referrer);
         image.scaleFactor = scaleFactor;
         m_imagesInSet.append(image);
         ++i;
     }
 
@@ skipping 100 matching lines @@
 CSSImageSetValue* CSSImageSetValue::valueWithURLsMadeAbsolute()
 {
     CSSImageSetValue* value = CSSImageSetValue::create();
     for (auto& item : *this)
         item->isImageValue() ? value->append(toCSSImageValue(*item).valueWithURLMadeAbsolute()) : value->append(item);
     return value;
 }
 
 
 } // namespace blink