Revert of Set proper referrer for css resource fetching

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 @@
 {
     if (m_imageSet && m_imageSet->isImageResourceSet())
         toStyleFetchedImageSet(m_imageSet)->clearImageSetValue();
 }
 
 void CSSImageSetValue::fillImageSet()
 {
     size_t length = this->length();
     size_t i = 0;
     while (i < length) {
-        CSSImageValue* imageValue = toCSSImageValue(item(i));
-        String imageURL = imageValue->url();
+        CSSValue* imageValue = item(i);
+        String imageURL = toCSSImageValue(imageValue)->url();
 
         ++i;
         ASSERT_WITH_SECURITY_IMPLICATION(i < length);
         CSSValue* scaleFactorValue = item(i);
         float scaleFactor = toCSSPrimitiveValue(scaleFactorValue)->getFloatValue();
 
         ImageWithScale image;
         image.imageURL = imageURL;
-        image.referrer = imageValue->referrer();
         image.scaleFactor = scaleFactor;
         m_imagesInSet.append(image);
         ++i;
     }
 
     // Sort the images so that they are stored in order from lowest resolution to highest.
     std::sort(m_imagesInSet.begin(), m_imagesInSet.end(), CSSImageSetValue::compareByScaleFactor);
 }
 
 CSSImageSetValue::ImageWithScale CSSImageSetValue::bestImageForScaleFactor()
@@ skipping 17 matching lines @@
     if (!m_imagesInSet.size())
         fillImageSet();
 
     if (!m_accessedBestFitImage) {
         // FIXME: In the future, we want to take much more than deviceScaleFactor into acount here.
         // All forms of scale should be included: Page::pageScaleFactor(), LocalFrame::pageZoomFactor(),
         // and any CSS transforms. https://bugs.webkit.org/show_bug.cgi?id=81698
         ImageWithScale image = bestImageForScaleFactor();
         if (Document* document = loader->document()) {
             FetchRequest request(ResourceRequest(document->completeURL(image.imageURL)), FetchInitiatorTypeNames::css, options);
-            if (!image.referrer.isEmpty())
-                request.mutableResourceRequest().setHTTPReferrer(Referrer(image.referrer, ReferrerPolicyDefault));
 
             if (options.corsEnabled == IsCORSEnabled)
                 request.setCrossOriginAccessControl(loader->document()->securityOrigin(), options.allowCredentials, options.credentialsRequested);
 
             if (ResourcePtr<ImageResource> cachedImage = loader->fetchImage(request)) {
                 m_imageSet = StyleFetchedImageSet::create(cachedImage.get(), image.scaleFactor, this);
                 m_accessedBestFitImage = true;
             }
         }
     }
@@ skipping 67 matching lines @@
 {
     // Non-CSSValueList data is not accessible through CSS OM, no need to clone.
 }
 
 PassRefPtrWillBeRawPtr<CSSImageSetValue> CSSImageSetValue::cloneForCSSOM() const
 {
     return adoptRefWillBeRefCountedGarbageCollected(new CSSImageSetValue(*this));
 }
 
 } // namespace WebCore