Move Image ownership out of CSSValue

Source/core/css/parser/CSSPropertyParser.cpp

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
@@ skipping 298 matching lines @@
 }
 
 inline PassRefPtrWillBeRawPtr<CSSPrimitiveValue> CSSPropertyParser::createPrimitiveCustomIdentValue(CSSParserValue* value)
 {
     ASSERT(value->unit() == CSSPrimitiveValue::UnitType::String || value->m_unit == CSSParserValue::Identifier);
     return cssValuePool().createValue(value->string, CSSPrimitiveValue::UnitType::CustomIdentifier);
 }
 
 inline PassRefPtrWillBeRawPtr<CSSValue> CSSPropertyParser::createCSSImageValueWithReferrer(const String& rawValue, const KURL& url)
 {
-    RefPtrWillBeRawPtr<CSSValue> imageValue = CSSImageValue::create(rawValue, url);
-    toCSSImageValue(imageValue.get())->setReferrer(m_context.referrer());
+    RefPtrWillBeRawPtr<CSSImageValue> imageValue = CSSImageValue::create(rawValue, url);
+    imageValue->setReferrer(m_context.referrer());
     return imageValue;
 }
 
 static inline bool isComma(CSSParserValue* value)
 {
     ASSERT(value);
     return value->m_unit == CSSParserValue::Operator && value->iValue == ',';
 }
 
 static bool consumeComma(CSSParserValueList* valueList)
@@ skipping 7763 matching lines @@
         }
     }
 
     if (!list->length())
         return nullptr;
 
     return list.release();
 }
 
 } // namespace blink