Fix -Wnon-virtual-dtor compiler warnings.

core/src/fpdfdoc/tagged_int.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
  
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef _FPDF_TAGGED_INT_H_
 #define _FPDF_TAGGED_INT_H_
-class CPDF_StructTreeImpl;
+
+#include "../../include/fpdfdoc/fpdf_tagged.h"
+
 class CPDF_StructElementImpl;
 class CPDF_StructTreeImpl : public CPDF_StructTree
 {
 public:
     CPDF_StructTreeImpl(const CPDF_Document* pDoc);
     ~CPDF_StructTreeImpl();
     int                 CountTopElements() const
     {
         return m_Kids.GetSize();
     }
     CPDF_StructElement* GetTopElement(int i) const
     {
         return (CPDF_StructElement*)m_Kids.GetAt(i);
     }
     void                LoadDocTree();
     void                LoadPageTree(const CPDF_Dictionary* pPageDict);
     CPDF_StructElementImpl* AddPageNode(CPDF_Dictionary* pElement, CFX_MapPtrToPtr& map, int nLevel = 0);
     FX_BOOL             AddTopLevelNode(CPDF_Dictionary* pDict, CPDF_StructElementImpl* pElement);
 protected:
     const CPDF_Dictionary*      m_pTreeRoot;
     const CPDF_Dictionary*      m_pRoleMap;
     const CPDF_Dictionary*      m_pPage;
     CFX_ArrayTemplate<CPDF_StructElementImpl*>  m_Kids;
     friend class CPDF_StructElementImpl;
 };
 class CPDF_StructElementImpl FX_FINAL : public CPDF_StructElement
 {
 public:
     CPDF_StructElementImpl(CPDF_StructTreeImpl* pTree, CPDF_StructElementImpl* pParent, CPDF_Dictionary* pDict);
-    ~CPDF_StructElementImpl();
     CPDF_StructTree*            GetTree() const
     {
         return m_pTree;
     }
     const CFX_ByteString&       GetType() const
     {
         return m_Type;
     }
     CPDF_StructElement*         GetParent() const
     {
@@ skipping 22 matching lines @@
     FX_ARGB                                     GetColor(FX_BSTR owner, FX_BSTR name, FX_ARGB default_value, FX_BOOL bInheritable = FALSE, int subindex = -1);
     FX_FLOAT                            GetNumber(FX_BSTR owner, FX_BSTR name, FX_FLOAT default_value, FX_BOOL bInheritable = FALSE, int subindex = -1);
     int                                         GetInteger(FX_BSTR owner, FX_BSTR name, int default_value, FX_BOOL bInheritable = FALSE, int subindex = -1);
     CFX_PtrArray                        m_ObjectArray;
     void                                        LoadKids(CPDF_Dictionary* pDict);
     void                                        LoadKid(FX_DWORD PageObjNum, CPDF_Object* pObj, CPDF_StructKid* pKid);
     CPDF_Object*                        GetAttr(FX_BSTR owner, FX_BSTR name, FX_BOOL bInheritable, int subindex);
     CPDF_StructElementImpl*     Retain();
     void                                        Release();
 protected:
+    ~CPDF_StructElementImpl();
+
     CPDF_StructTreeImpl*        m_pTree;
     CFX_ByteString                      m_Type;
     CPDF_StructElementImpl*     m_pParent;
     CPDF_Dictionary*            m_pDict;
     CFX_ArrayTemplate<CPDF_StructKid>   m_Kids;
+    int                 m_RefCount;
 
-    int                 m_RefCount;
     friend class CPDF_StructTreeImpl;
 };
 #endif