CSSParser should return ImmutableStylePropertySets.

Source/core/css/CSSParser.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 1280 matching lines @@
 {
     m_selectorListForParseSelector = &selectorList;
 
     setupParser("@-internal-selector{", string, "}");
 
     cssyyparse(this);
 
     m_selectorListForParseSelector = 0;
 }
 
-PassRefPtr<StylePropertySet> CSSParser::parseInlineStyleDeclaration(const String& string, Element* element)
+PassRefPtr<ImmutableStylePropertySet> CSSParser::parseInlineStyleDeclaration(const String& string, Element* element)
 {
     Document* document = element->document();
     CSSParserContext context = document->elementSheet()->contents()->parserContext();
     context.mode = strictToCSSParserMode(element->isHTMLElement() && !document->inQuirksMode());
     return CSSParser(context, UseCounter::getFrom(document)).parseDeclaration(string, document->elementSheet()->contents());
 }
 
-PassRefPtr<StylePropertySet> CSSParser::parseDeclaration(const String& string, StyleSheetContents* contextStyleSheet)
+PassRefPtr<ImmutableStylePropertySet> CSSParser::parseDeclaration(const String& string, StyleSheetContents* contextStyleSheet)
 {
     setStyleSheet(contextStyleSheet);
 
     setupParser("@-internal-decls{", string, "} ");
     cssyyparse(this);
     m_rule = 0;
 
     if (m_hasFontFaceOnlyValues)
         deleteFontFaceOnlyValues();
 
-    RefPtr<StylePropertySet> style = createStylePropertySet();
+    RefPtr<ImmutableStylePropertySet> style = createStylePropertySet();
     clearProperties();
     return style.release();
 }
 
 
 bool CSSParser::parseDeclaration(StylePropertySet* declaration, const String& string, SourceDataHandler* sourceDataHandler, StyleSheetContents* contextStyleSheet)
 {
     setStyleSheet(contextStyleSheet);
 
     m_sourceDataHandler = sourceDataHandler;
@@ skipping 54 matching lines @@
             continue;
         }
         const unsigned propertyIDIndex = property.id() - firstCSSProperty;
         if (seenProperties.get(propertyIDIndex))
             continue;
         seenProperties.set(propertyIDIndex);
         output[--unusedEntries] = property;
     }
 }
 
-PassRefPtr<StylePropertySet> CSSParser::createStylePropertySet()
+PassRefPtr<ImmutableStylePropertySet> CSSParser::createStylePropertySet()
 {
     BitArray<numCSSProperties> seenProperties;
     size_t unusedEntries = m_parsedProperties.size();
     Vector<CSSProperty, 256> results(unusedEntries);
 
     // Important properties have higher priority, so add them first. Duplicate definitions can then be ignored when found.
     HashSet<AtomicString> seenVariables;
     filterProperties(true, m_parsedProperties, results, unusedEntries, seenProperties, seenVariables);
     filterProperties(false, m_parsedProperties, results, unusedEntries, seenProperties, seenVariables);
     if (unusedEntries)
@@ skipping 10331 matching lines @@
 {
     // The tokenizer checks for the construct of an+b.
     // However, since the {ident} rule precedes the {nth} rule, some of those
     // tokens are identified as string literal. Furthermore we need to accept
     // "odd" and "even" which does not match to an+b.
     return equalIgnoringCase(token, "odd") || equalIgnoringCase(token, "even")
         || equalIgnoringCase(token, "n") || equalIgnoringCase(token, "-n");
 }
 
 }