Move create() methods from StylePropertySet to MutableStylePropertySet.

Source/core/css/WebKitCSSMatrix.cpp

 /*
  * Copyright (C) 2008 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 @@
 
 WebKitCSSMatrix::~WebKitCSSMatrix()
 {
 }
 
 void WebKitCSSMatrix::setMatrixValue(const String& string, ExceptionCode& ec)
 {
     if (string.isEmpty())
         return;
 
-    RefPtr<StylePropertySet> styleDeclaration = StylePropertySet::create();
+    RefPtr<MutableStylePropertySet> styleDeclaration = MutableStylePropertySet::create();
     if (CSSParser::parseValue(styleDeclaration.get(), CSSPropertyWebkitTransform, string, true, CSSStrictMode, 0)) {
         // Convert to TransformOperations. This can fail if a property
         // requires style (i.e., param uses 'ems' or 'exs')
         RefPtr<CSSValue> value = styleDeclaration->getPropertyCSSValue(CSSPropertyWebkitTransform);
 
         // Check for a "none" or empty transform. In these cases we can use the default identity matrix.
         if (!value || (value->isPrimitiveValue() && (toCSSPrimitiveValue(value.get()))->getIdent() == CSSValueNone))
             return;
 
         TransformOperations operations;
@@ skipping 113 matching lines @@
         return String::format("matrix(%f, %f, %f, %f, %f, %f)",
                                 m_matrix.a(), m_matrix.b(), m_matrix.c(), m_matrix.d(), m_matrix.e(), m_matrix.f());
     return String::format("matrix3d(%f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f, %f)",
                             m_matrix.m11(), m_matrix.m12(), m_matrix.m13(), m_matrix.m14(),
                             m_matrix.m21(), m_matrix.m22(), m_matrix.m23(), m_matrix.m24(),
                             m_matrix.m31(), m_matrix.m32(), m_matrix.m33(), m_matrix.m34(),
                             m_matrix.m41(), m_matrix.m42(), m_matrix.m43(), m_matrix.m44());
 }
 
 } // namespace WebCore