Refactoring: Use enum class for SerializationType

Source/core/editing/MarkupAccumulator.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 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 @@
 
     // Non-breaking space needs to be escaped in innerHTML for compatibility reason. See http://trac.webkit.org/changeset/32879
     // However, we cannot do this in a XML document because it does not have the entity reference defined (See the bug 19215).
     EntityMaskInCDATA = 0,
     EntityMaskInPCDATA = EntityAmp | EntityLt | EntityGt,
     EntityMaskInHTMLPCDATA = EntityMaskInPCDATA | EntityNbsp,
     EntityMaskInAttributeValue = EntityAmp | EntityQuot | EntityLt | EntityGt,
     EntityMaskInHTMLAttributeValue = EntityAmp | EntityQuot | EntityNbsp,
 };
 
-enum SerializationType {
+enum class SerializationType {
     AsOwnerDocument,
     ForcedXML
 };
 
 class MarkupAccumulator {
     WTF_MAKE_NONCOPYABLE(MarkupAccumulator);
     STACK_ALLOCATED();
 public:
     static void appendComment(StringBuilder&, const String&);
     static void appendCharactersReplacingEntities(StringBuilder&, const String&, unsigned, unsigned, EntityMask);
     static size_t totalLength(const Vector<String>&);
 
-    MarkupAccumulator(EAbsoluteURLs, SerializationType = AsOwnerDocument);
+    MarkupAccumulator(EAbsoluteURLs, SerializationType = SerializationType::AsOwnerDocument);
     virtual ~MarkupAccumulator();
 
     void appendString(const String&);
     virtual void appendStartTag(Node&, Namespaces* = nullptr);
     virtual void appendEndTag(const Element&);
     void appendStartMarkup(StringBuilder&, Node&, Namespaces*);
     void appendEndMarkup(StringBuilder&, const Element&);
 
     size_t length() const { return m_markup.length(); }
     void concatenateMarkup(StringBuilder&) const;
@@ skipping 31 matching lines @@
 };
 
 template<typename Strategy>
 String serializeNodes(MarkupAccumulator&, Node&, EChildrenOnly);
 
 extern template String serializeNodes<EditingStrategy>(MarkupAccumulator&, Node&, EChildrenOnly);
 
 }
 
 #endif