[Oilpan]: Make StylePropertySet fully garbage collected.

Source/core/css/parser/BisonCSSParser-in.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 1196 matching lines @@
 {
     m_selectorListForParseSelector = &selectorList;
 
     setupParser("@-internal-selector ", string, "");
 
     cssyyparse(this);
 
     m_selectorListForParseSelector = 0;
 }
 
-PassRefPtr<ImmutableStylePropertySet> BisonCSSParser::parseInlineStyleDeclaration(const String& string, Element* element)
+PassRefPtrWillBeRawPtr<ImmutableStylePropertySet> BisonCSSParser::parseInlineStyleDeclaration(const String& string, Element* element)
 {
     Document& document = element->document();
     CSSParserContext context = CSSParserContext(document.elementSheet().contents()->parserContext(), UseCounter::getFrom(&document));
     context.setMode((element->isHTMLElement() && !document.inQuirksMode()) ? HTMLStandardMode : HTMLQuirksMode);
     return BisonCSSParser(context).parseDeclaration(string, document.elementSheet().contents());
 }
 
-PassRefPtr<ImmutableStylePropertySet> BisonCSSParser::parseDeclaration(const String& string, StyleSheetContents* contextStyleSheet)
+PassRefPtrWillBeRawPtr<ImmutableStylePropertySet> BisonCSSParser::parseDeclaration(const String& string, StyleSheetContents* contextStyleSheet)
 {
     setStyleSheet(contextStyleSheet);
 
     setupParser("@-internal-decls ", string, "");
     cssyyparse(this);
     m_rule = nullptr;
 
     if (m_hasFontFaceOnlyValues)
         deleteFontFaceOnlyValues();
 
-    RefPtr<ImmutableStylePropertySet> style = createStylePropertySet();
+    RefPtrWillBeRawPtr<ImmutableStylePropertySet> style = createStylePropertySet();
     clearProperties();
     return style.release();
 }
 
 
 bool BisonCSSParser::parseDeclaration(MutableStylePropertySet* declaration, const String& string, CSSParserObserver* observer, StyleSheetContents* contextStyleSheet)
 {
     setStyleSheet(contextStyleSheet);
 
     TemporaryChange<CSSParserObserver*> scopedObsever(m_observer, observer);
@@ skipping 48 matching lines @@
         if (property.isImportant() != important)
             continue;
         const unsigned propertyIDIndex = property.id() - firstCSSProperty;
         if (seenProperties.get(propertyIDIndex))
             continue;
         seenProperties.set(propertyIDIndex);
         output[--unusedEntries] = property;
     }
 }
 
-PassRefPtr<ImmutableStylePropertySet> BisonCSSParser::createStylePropertySet()
+PassRefPtrWillBeRawPtr<ImmutableStylePropertySet> BisonCSSParser::createStylePropertySet()
 {
     BitArray<numCSSProperties> seenProperties;
     size_t unusedEntries = m_parsedProperties.size();
     WillBeHeapVector<CSSProperty, 256> results(unusedEntries);
 
     // Important properties have higher priority, so add them first. Duplicate definitions can then be ignored when found.
     filterProperties(true, m_parsedProperties, results, unusedEntries, seenProperties);
     filterProperties(false, m_parsedProperties, results, unusedEntries, seenProperties);
     if (unusedEntries)
         results.remove(0, unusedEntries);
@@ skipping 933 matching lines @@
     rule->setProperties(createStylePropertySet());
     clearProperties();
 
     StyleRuleViewport* result = rule.get();
     m_parsedRules.append(rule.release());
 
     return result;
 }
 
 }