Revert of [Oilpan] Prepare full definition of classes before using Member

third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.h

 /*
  * Copyright (C) 2010 Google, 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 102 matching lines @@
     UseCounter* useCounter() { return UseCounter::getFrom(contextForParsingSession()); }
 
 protected:
     void insert(const SegmentedString&) final;
     void append(const String&) override;
     void finish() final;
 
     HTMLDocumentParser(HTMLDocument&, bool reportErrors, ParserSynchronizationPolicy);
     HTMLDocumentParser(DocumentFragment*, Element* contextElement, ParserContentPolicy);
 
-    HTMLTreeBuilder* treeBuilder() const;
+    HTMLTreeBuilder* treeBuilder() const { return m_treeBuilder.get(); }
 
     void forcePlaintextForTextDocument();
 
 private:
     static PassRefPtrWillBeRawPtr<HTMLDocumentParser> create(DocumentFragment* fragment, Element* contextElement, ParserContentPolicy parserContentPolicy)
     {
         return adoptRefWillBeNoop(new HTMLDocumentParser(fragment, contextElement, parserContentPolicy));
     }
 
     // DocumentParser
@@ skipping 75 matching lines @@
     bool m_haveBackgroundParser;
     bool m_tasksWereSuspended;
     unsigned m_pumpSessionNestingLevel;
     unsigned m_pumpSpeculationsSessionNestingLevel;
     bool m_isParsingAtLineNumber;
 };
 
 }
 
 #endif