Use smart pointers for graphics device classes

core/fxge/ge/fx_ge_device.cpp

 // 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
 
 #include "core/fxge/include/fx_ge.h"
 #include "core/fxge/include/ifx_renderdevicedriver.h"
 
 #if defined _SKIA_SUPPORT_
 #include "third_party/skia/include/core/SkTypes.h"
 #endif
 
 CFX_RenderDevice::CFX_RenderDevice()
     : m_pBitmap(nullptr),
       m_Width(0),
       m_Height(0),
       m_bpp(0),
       m_RenderCaps(0),
-      m_DeviceClass(0),
-      m_pDeviceDriver(nullptr) {}
+      m_DeviceClass(0) {}
 
-CFX_RenderDevice::~CFX_RenderDevice() {
-  delete m_pDeviceDriver;
-}
-
-void CFX_RenderDevice::Flush() {
-  delete m_pDeviceDriver;
-  m_pDeviceDriver = nullptr;
-}
+CFX_RenderDevice::~CFX_RenderDevice() {}
 
 void CFX_RenderDevice::SetDeviceDriver(IFX_RenderDeviceDriver* pDriver) {
-  delete m_pDeviceDriver;
-  m_pDeviceDriver = pDriver;
+  m_pDeviceDriver.reset(pDriver);
   InitDeviceInfo();
 }
 
 void CFX_RenderDevice::InitDeviceInfo() {
   m_Width = m_pDeviceDriver->GetDeviceCaps(FXDC_PIXEL_WIDTH);
   m_Height = m_pDeviceDriver->GetDeviceCaps(FXDC_PIXEL_HEIGHT);
   m_bpp = m_pDeviceDriver->GetDeviceCaps(FXDC_BITS_PIXEL);
   m_RenderCaps = m_pDeviceDriver->GetDeviceCaps(FXDC_RENDER_CAPS);
   m_DeviceClass = m_pDeviceDriver->GetDeviceCaps(FXDC_DEVICE_CLASS);
   if (!m_pDeviceDriver->GetClipBox(&m_ClipBox)) {
@@ skipping 444 matching lines @@
 void CFX_RenderDevice::CancelDIBits(void* handle) {
   m_pDeviceDriver->CancelDIBits(handle);
 }
 
 #ifdef _SKIA_SUPPORT_
 
 void CFX_RenderDevice::DebugVerifyBitmapIsPreMultiplied() const {
   SkASSERT(0);
 }
 #endif