Make code compile with clang_use_chrome_plugin (part V)

xfa/fxfa/include/xfa_ffapp.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_FXFA_INCLUDE_XFA_FFAPP_H_
 #define XFA_FXFA_INCLUDE_XFA_FFAPP_H_
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_stream.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_stream_acc.h"
 #include "xfa/fgas/font/fgas_font.h"
 #include "xfa/fwl/core/ifwl_app.h"
 #include "xfa/fxfa/include/fxfa.h"
 
 class CFWL_WidgetMgrDelegate;
 class CXFA_DefFontMgr;
 class CXFA_FWLAdapterWidgetMgr;
 class CXFA_FWLTheme;
 class CXFA_FFDocHandler;
 class CXFA_FontMgr;
 class IFWL_AdapterTimerMgr;
 
 class CXFA_FileRead : public IFX_FileRead {
  public:
   explicit CXFA_FileRead(const CFX_ArrayTemplate<CPDF_Stream*>& streams);
+  ~CXFA_FileRead() override;
 
-  virtual FX_FILESIZE GetSize();
-  virtual FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size);
-
-  virtual void Release() { delete this; }
+  // IFX_FileRead
+  FX_FILESIZE GetSize() override;
+  FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
+  void Release() override;
 
  protected:
   CFX_ObjectArray<CPDF_StreamAcc> m_Data;
 };
 
 class CXFA_FFApp {
  public:
   explicit CXFA_FFApp(IXFA_AppProvider* pProvider);
   ~CXFA_FFApp();
 
@@ skipping 23 matching lines @@
   CXFA_FontMgr* m_pFontMgr;
 #if _FXM_PLATFORM_ != _FXM_PLATFORM_WINDOWS_
   CFX_FontSourceEnum_File* m_pFontSource;
 #endif
   CXFA_FWLAdapterWidgetMgr* m_pAdapterWidgetMgr;
   CFWL_WidgetMgrDelegate* m_pWidgetMgrDelegate;
   IFGAS_FontMgr* m_pFDEFontMgr;
 };
 
 #endif  // XFA_FXFA_INCLUDE_XFA_FFAPP_H_