Use smart pointers for class owned pointers under xfa/fde

xfa/fde/fde_gedevice.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 "xfa/fde/fde_gedevice.h"
 
 #include <algorithm>
 
 #include "xfa/fde/cfde_path.h"
 #include "xfa/fde/fde_object.h"
 #include "xfa/fgas/font/fgas_font.h"
 #include "xfa/fgas/font/fgas_gefont.h"
 
 CFDE_RenderDevice::CFDE_RenderDevice(CFX_RenderDevice* pDevice,
                                      FX_BOOL bOwnerDevice)
     : m_pDevice(pDevice),
       m_bOwnerDevice(bOwnerDevice),
-      m_pCharPos(nullptr),
       m_iCharCount(0) {
   ASSERT(pDevice);
 
   FX_RECT rt = m_pDevice->GetClipBox();
   m_rtClip.Set((FX_FLOAT)rt.left, (FX_FLOAT)rt.top, (FX_FLOAT)rt.Width(),
                (FX_FLOAT)rt.Height());
 }
 
 CFDE_RenderDevice::~CFDE_RenderDevice() {
-  FX_Free(m_pCharPos);
   if (m_bOwnerDevice)
     delete m_pDevice;
 }
 int32_t CFDE_RenderDevice::GetWidth() const {
   return m_pDevice->GetWidth();
 }
 int32_t CFDE_RenderDevice::GetHeight() const {
   return m_pDevice->GetHeight();
 }
 void CFDE_RenderDevice::SaveState() {
@@ skipping 280 matching lines @@
                                     const CFX_Matrix* pMatrix) {
   CFDE_Path* pGePath = (CFDE_Path*)pPath;
   if (!pGePath)
     return FALSE;
   if (!pBrush)
     return FALSE;
   return m_pDevice->DrawPath(&pGePath->m_Path, pMatrix, nullptr,
                              pBrush->GetColor(), 0, FXFILL_WINDING);
 }