Use smart pointers for class owned pointers

fpdfsdk/pdfwindow/PWL_FontMap.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 "fpdfsdk/pdfwindow/PWL_FontMap.h"
 
 #include "core/fpdfapi/fpdf_font/include/cpdf_font.h"
 #include "core/fpdfapi/fpdf_font/include/cpdf_fontencoding.h"
@@ skipping 17 matching lines @@
                                              "Times-Roman",
                                              "Times-Bold",
                                              "Times-Italic",
                                              "Times-BoldItalic",
                                              "Symbol",
                                              "ZapfDingbats"};
 
 }  // namespace
 
 CPWL_FontMap::CPWL_FontMap(CFX_SystemHandler* pSystemHandler)
-    : m_pPDFDoc(nullptr), m_pSystemHandler(pSystemHandler) {
+    : m_pSystemHandler(pSystemHandler) {
   ASSERT(m_pSystemHandler);
 }
 
 CPWL_FontMap::~CPWL_FontMap() {
-  delete m_pPDFDoc;
-  m_pPDFDoc = nullptr;
-
   Empty();
 }
 
 void CPWL_FontMap::SetSystemHandler(CFX_SystemHandler* pSystemHandler) {
   m_pSystemHandler = pSystemHandler;
 }
 
 CPDF_Document* CPWL_FontMap::GetDocument() {
   if (!m_pPDFDoc) {
     if (CPDF_ModuleMgr::Get()) {
-      m_pPDFDoc = new CPDF_Document(nullptr);
+      m_pPDFDoc.reset(new CPDF_Document(nullptr));
       m_pPDFDoc->CreateNewDoc();
     }
   }
 
-  return m_pPDFDoc;
+  return m_pPDFDoc.get();
 }
 
 CPDF_Font* CPWL_FontMap::GetPDFFont(int32_t nFontIndex) {
   if (nFontIndex >= 0 && nFontIndex < m_aData.GetSize()) {
     if (CPWL_FontMap_Data* pData = m_aData.GetAt(nFontIndex)) {
       return pData->pFont;
     }
   }
 
   return nullptr;
@@ skipping 418 matching lines @@
 
 CPWL_DocFontMap::CPWL_DocFontMap(CFX_SystemHandler* pSystemHandler,
                                  CPDF_Document* pAttachedDoc)
     : CPWL_FontMap(pSystemHandler), m_pAttachedDoc(pAttachedDoc) {}
 
 CPWL_DocFontMap::~CPWL_DocFontMap() {}
 
 CPDF_Document* CPWL_DocFontMap::GetDocument() {
   return m_pAttachedDoc;
 }