Move StylePropertySet::createImmutable() to ImmutableStylePropertySet.

Source/core/css/StylePropertySet.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 38 matching lines @@
 {
     DEFINE_STATIC_LOCAL(PropertySetCSSOMWrapperMap, propertySetCSSOMWrapperMapInstance, ());
     return propertySetCSSOMWrapperMapInstance;
 }
 
 static size_t sizeForImmutableStylePropertySetWithPropertyCount(unsigned count)
 {
     return sizeof(ImmutableStylePropertySet) - sizeof(void*) + sizeof(CSSValue*) * count + sizeof(StylePropertyMetadata) * count;
 }
 
-PassRefPtr<StylePropertySet> StylePropertySet::createImmutable(const CSSProperty* properties, unsigned count, CSSParserMode cssParserMode)
+PassRefPtr<ImmutableStylePropertySet> ImmutableStylePropertySet::create(const CSSProperty* properties, unsigned count, CSSParserMode cssParserMode)
 {
     void* slot = WTF::fastMalloc(sizeForImmutableStylePropertySetWithPropertyCount(count));
     return adoptRef(new (slot) ImmutableStylePropertySet(properties, count, cssParserMode));
 }
 
-PassRefPtr<StylePropertySet> StylePropertySet::immutableCopyIfNeeded() const
+PassRefPtr<ImmutableStylePropertySet> StylePropertySet::immutableCopyIfNeeded() const
 {
     if (!isMutable())
-        return const_cast<StylePropertySet*>(this);
-    return createImmutable(mutablePropertyVector().data(), mutablePropertyVector().size(), cssParserMode());
+        return static_cast<ImmutableStylePropertySet*>(const_cast<StylePropertySet*>(this));
+    return ImmutableStylePropertySet::create(mutablePropertyVector().data(), mutablePropertyVector().size(), cssParserMode());
 }
 
 MutableStylePropertySet::MutableStylePropertySet(const CSSProperty* properties, unsigned length)
     : StylePropertySet(CSSStrictMode)
 {
     m_propertyVector.reserveInitialCapacity(length);
     for (unsigned i = 0; i < length; ++i)
         m_propertyVector.uncheckedAppend(properties[i]);
 }
 
@@ skipping 522 matching lines @@
     result.appendLiteral(": ");
     result.append(propertyValue()->cssText());
     if (isImportant())
         result.appendLiteral(" !important");
     result.append(';');
     return result.toString();
 }
 
 
 } // namespace WebCore