Make code compile with clang_use_chrome_plugin (final)

xfa/fde/css/fde_csscache.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 XFA_FDE_CSS_FDE_CSSCACHE_H_
 #define XFA_FDE_CSS_FDE_CSSCACHE_H_
 
 #include <map>
 
 #include "xfa/fde/css/fde_css.h"
 #include "xfa/fgas/crt/fgas_memory.h"
 
 class FDE_CSSCacheItem : public CFX_Target {
  public:
   explicit FDE_CSSCacheItem(IFDE_CSSStyleSheet* p);
-  ~FDE_CSSCacheItem();
+  ~FDE_CSSCacheItem() override;
 
   IFDE_CSSStyleSheet* pStylesheet;
   uint32_t dwActivity;
 };
 
 class FDE_CSSTagCache : public CFX_Target {
  public:
   FDE_CSSTagCache(FDE_CSSTagCache* parent, CXFA_CSSTagProvider* tag);
   FDE_CSSTagCache(const FDE_CSSTagCache& it);
+  ~FDE_CSSTagCache() override;
 
   FDE_CSSTagCache* GetParent() const { return pParent; }
   CXFA_CSSTagProvider* GetTag() const { return pTag; }
 
   uint32_t HashID() const { return dwIDHash; }
   uint32_t HashTag() const { return dwTagHash; }
   int32_t CountHashClass() const { return dwClassHashs.GetSize(); }
 
   void SetClassIndex(int32_t index) { iClassIndex = index; }
   uint32_t HashClass() const {
     return iClassIndex < dwClassHashs.GetSize()
                ? dwClassHashs.GetAt(iClassIndex)
                : 0;
   }
 
  protected:
   CXFA_CSSTagProvider* pTag;
   FDE_CSSTagCache* pParent;
   uint32_t dwIDHash;
   uint32_t dwTagHash;
   int32_t iClassIndex;
   CFX_BaseArrayTemplate<uint32_t> dwClassHashs;
 };
 typedef CFX_ObjectStackTemplate<FDE_CSSTagCache> CFDE_CSSTagStack;
 
 class CFDE_CSSAccelerator : public CFX_Target {
  public:
+  CFDE_CSSAccelerator();
+  ~CFDE_CSSAccelerator() override;
+
   void OnEnterTag(CXFA_CSSTagProvider* pTag);
   void OnLeaveTag(CXFA_CSSTagProvider* pTag);
 
   void Clear() { m_Stack.RemoveAll(); }
 
   FDE_CSSTagCache* GetTopElement() const { return m_Stack.GetTopElement(); }
 
  protected:
   CFDE_CSSTagStack m_Stack;
 };
 
 #endif  // XFA_FDE_CSS_FDE_CSSCACHE_H_