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

core/src/fxge/apple/apple_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 _APPLE_INT_H_
 #define _APPLE_INT_H_
 #if _FXM_PLATFORM_  == _FXM_PLATFORM_APPLE_
 #if _FX_OS_ == _FX_MACOSX_
@@ skipping 167 matching lines @@
     FX_INT32        m_saveCount;
 
     FX_INT32            _width;
     FX_INT32            _height;
     FX_INT32            _bitsPerPixel;
     FX_INT32            _deviceClass;
     FX_INT32            _renderCaps;
     FX_INT32    _horzSize;
     FX_INT32    _vertSize;
 };
-class CFX_FontProvider : public IFX_FileRead
+class CFX_FontProvider FX_FINAL : public IFX_FileRead
 {
 public:
     virtual void                        Release()
     {
         delete this;
     }
     virtual FX_FILESIZE         GetSize()
     {
         return (FX_FILESIZE)_totalSize;
     }
@@ skipping 38 matching lines @@
     size_t * _tableOffsets;
     int _tableCount;
     int _totalSize;
 };
 FX_UINT32 FX_GetHashCode( FX_LPCSTR pStr);
 FX_DWORD  FX_IOSGetMatchFamilyNameHashcode(FX_LPCSTR pFontName);
 FX_UINT32 FX_IOSGetFamilyNamesCount();
 FX_LPCSTR FX_IOSGetFamilyName( FX_UINT32 uIndex);
 #endif
 #endif