Use more const references in MarkupAccumulator and its subclasses

Source/core/editing/markup.h

 /*
  * Copyright (C) 2004 Apple Computer, 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 43 matching lines @@
 PassRefPtr<DocumentFragment> createFragmentForTransformToFragment(const String&, const String& sourceMIMEType, Document& outputDoc);
 PassRefPtr<DocumentFragment> createContextualFragment(const String&, HTMLElement*, ParserContentPolicy, ExceptionState&);
 
 bool isPlainTextMarkup(Node*);
 
 // These methods are used by HTMLElement & ShadowRoot to replace the
 // children with respected fragment/text.
 void replaceChildrenWithFragment(ContainerNode*, PassRefPtr<DocumentFragment>, ExceptionState&);
 void replaceChildrenWithText(ContainerNode*, const String&, ExceptionState&);
 
-String createMarkup(const Range*, Vector<Node*>* = 0, EAnnotateForInterchange = DoNotAnnotateForInterchange, bool convertBlocksToInlines = false, EAbsoluteURLs = DoNotResolveURLs, Node* constrainingAncestor = 0);
-String createMarkup(const Node*, EChildrenOnly = IncludeNode, Vector<Node*>* = 0, EAbsoluteURLs = DoNotResolveURLs, Vector<QualifiedName>* tagNamesToSkip = 0);
+String createMarkup(const Range*, Vector<const Node*>* = 0, EAnnotateForInterchange = DoNotAnnotateForInterchange, bool convertBlocksToInlines = false, EAbsoluteURLs = DoNotResolveURLs, Node* constrainingAncestor = 0);
+String createMarkup(const Node*, EChildrenOnly = IncludeNode, Vector<const Node*>* = 0, EAbsoluteURLs = DoNotResolveURLs, Vector<QualifiedName>* tagNamesToSkip = 0);
 
 String createFullMarkup(const Node*);
 
 String urlToMarkup(const KURL&, const String& title);
 void mergeWithNextTextNode(PassRefPtr<Node>, ExceptionState&);
 
 }
 
 #endif // markup_h