Use smart pointers for graphics device classes

core/fxge/include/fx_ge.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_INCLUDE_FX_GE_H_
 #define CORE_FXGE_INCLUDE_FX_GE_H_
 
 #include <memory>
@@ skipping 196 matching lines @@
   uint32_t m_ExtGID;
 #endif
   bool m_bFontStyle;
 };
 
 class CFX_RenderDevice {
  public:
   CFX_RenderDevice();
   virtual ~CFX_RenderDevice();
 
-  void Flush();
-  void SetDeviceDriver(IFX_RenderDeviceDriver* pDriver);
-  IFX_RenderDeviceDriver* GetDeviceDriver() const { return m_pDeviceDriver; }
+  // Take ownership of |pDriver|.
+  void SetDeviceDriver(std::unique_ptr<IFX_RenderDeviceDriver> pDriver);
+  IFX_RenderDeviceDriver* GetDeviceDriver() const {
+    return m_pDeviceDriver.get();
+  }
 
   FX_BOOL StartRendering();
   void EndRendering();
   void SaveState();
   void RestoreState(bool bKeepSaved);
 
   int GetWidth() const { return m_Width; }
   int GetHeight() const { return m_Height; }
   int GetDeviceClass() const { return m_DeviceClass; }
   int GetBPP() const { return m_bpp; }
@@ skipping 163 matching lines @@
                              int fill_mode,
                              int blend_type);
 
   CFX_DIBitmap* m_pBitmap;
   int m_Width;
   int m_Height;
   int m_bpp;
   int m_RenderCaps;
   int m_DeviceClass;
   FX_RECT m_ClipBox;
-  IFX_RenderDeviceDriver* m_pDeviceDriver;
+  std::unique_ptr<IFX_RenderDeviceDriver> m_pDeviceDriver;
 };
 
 class CFX_FxgeDevice : public CFX_RenderDevice {
  public:
   CFX_FxgeDevice();
   ~CFX_FxgeDevice() override;
 
   bool Attach(CFX_DIBitmap* pBitmap,
               bool bRgbByteOrder,
               CFX_DIBitmap* pOriDevice,
               bool bGroupKnockout);
   bool Create(int width,
               int height,
               FXDIB_Format format,
               CFX_DIBitmap* pOriDevice);
 
 #ifdef _SKIA_SUPPORT_
   bool AttachRecorder(SkPictureRecorder* recorder);
   SkPictureRecorder* CreateRecorder(int size_x, int size_y);
   void DebugVerifyBitmapIsPreMultiplied() const override;
 #endif
 
  protected:
   bool m_bOwnedBitmap;
 };
 
 #endif  // CORE_FXGE_INCLUDE_FX_GE_H_