Use smart pointers for graphics device classes

core/fxge/agg/fx_agg_driver.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 CORE_FXGE_AGG_FX_AGG_DRIVER_H_
 #define CORE_FXGE_AGG_FX_AGG_DRIVER_H_
 
+#include <memory>
+#include <vector>
+
 #include "core/fxge/include/ifx_renderdevicedriver.h"
 #include "third_party/agg23/agg_clip_liang_barsky.h"
 #include "third_party/agg23/agg_path_storage.h"
 #include "third_party/agg23/agg_rasterizer_scanline_aa.h"
 
 class CFX_ClipRgn;
 class CFX_Matrix;
 class CFX_PathData;
 
 class CAgg_PathData {
@@ skipping 81 matching lines @@
                            int alpha_flag,
                            void* pIccTransform);
 
   void SetClipMask(agg::rasterizer_scanline_aa& rasterizer);
 
   virtual uint8_t* GetBuffer() const;
   const CFX_DIBitmap* GetBitmap() const;
 
  private:
   CFX_DIBitmap* m_pBitmap;
-  CFX_ClipRgn* m_pClipRgn;
-  CFX_ArrayTemplate<CFX_ClipRgn*> m_StateStack;
+  std::unique_ptr<CFX_ClipRgn> m_pClipRgn;
+  std::vector<std::unique_ptr<CFX_ClipRgn>> m_StateStack;
+#if _FXM_PLATFORM_ == _FXM_PLATFORM_APPLE_
   void* m_pPlatformGraphics;
-  void* m_pPlatformBitmap;
-  void* m_pDwRenderTartget;
+#endif
   int m_FillFlags;
   FX_BOOL m_bRgbByteOrder;
   CFX_DIBitmap* m_pOriDevice;
   FX_BOOL m_bGroupKnockout;
 };
 
 #endif  // CORE_FXGE_AGG_FX_AGG_DRIVER_H_