Have Element::ensureMutableInlineStyle() return a reference

Source/core/css/CSSPageRule.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2005, 2006, 2008, 2012 Apple Inc. 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 67 matching lines @@
     CSSStyleSheet::RuleMutationScope mutationScope(this);
 
     m_pageRule->wrapperAdoptSelectorList(selectorList);
 }
 
 String CSSPageRule::cssText() const
 {
     StringBuilder result;
     result.append(selectorText());
     result.appendLiteral(" { ");
-    String decls = m_pageRule->properties()->asText();
+    String decls = m_pageRule->properties().asText();
     result.append(decls);
     if (!decls.isEmpty())
         result.append(' ');
     result.append('}');
     return result.toString();
 }
 
 void CSSPageRule::reattach(StyleRuleBase* rule)
 {
     ASSERT(rule);
     m_pageRule = toStyleRulePage(rule);
     if (m_propertiesCSSOMWrapper)
         m_propertiesCSSOMWrapper->reattach(m_pageRule->mutableProperties());
 }
 
 void CSSPageRule::trace(Visitor* visitor)
 {
     visitor->trace(m_pageRule);
     CSSRule::trace(visitor);
 }
 
 } // namespace WebCore