pdfium: Fix all -Wdelete-non-virtual-dtor violations on Mac.

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;
 class CPDF_StructElementImpl;
@@ skipping 14 matching lines @@
     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 : public CPDF_StructElement
+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
     {
@@ skipping 36 matching lines @@
     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;
     friend class CPDF_StructTreeImpl;
 };
 #endif