Add ptr_util.h from base until std::make_unique<> available

fpdfsdk/pdfwindow/PWL_ListBox.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_ListBox.h"
 
 #include "fpdfsdk/fxedit/fxet_edit.h"
 #include "fpdfsdk/fxedit/fxet_list.h"
 #include "fpdfsdk/pdfwindow/PWL_Edit.h"
 #include "fpdfsdk/pdfwindow/PWL_EditCtrl.h"
 #include "fpdfsdk/pdfwindow/PWL_ScrollBar.h"
 #include "fpdfsdk/pdfwindow/PWL_Utils.h"
 #include "fpdfsdk/pdfwindow/PWL_Wnd.h"
 #include "public/fpdf_fwlevent.h"
+#include "third_party/base/ptr_util.h"
 
 CPWL_List_Notify::CPWL_List_Notify(CPWL_ListBox* pList) : m_pList(pList) {
   ASSERT(m_pList);
 }
 
 CPWL_List_Notify::~CPWL_List_Notify() {}
 
 void CPWL_List_Notify::IOnSetScrollInfoY(FX_FLOAT fPlateMin,
                                          FX_FLOAT fPlateMax,
                                          FX_FLOAT fContentMin,
@@ skipping 42 matching lines @@
 
 CPWL_ListBox::~CPWL_ListBox() {
 }
 
 CFX_ByteString CPWL_ListBox::GetClassName() const {
   return "CPWL_ListBox";
 }
 
 void CPWL_ListBox::OnCreated() {
   m_pList->SetFontMap(GetFontMap());
-  m_pListNotify = WrapUnique(new CPWL_List_Notify(this));
+  m_pListNotify = pdfium::MakeUnique<CPWL_List_Notify>(this);
   m_pList->SetNotify(m_pListNotify.get());
 
   SetHoverSel(HasFlag(PLBS_HOVERSEL));
   m_pList->SetMultipleSel(HasFlag(PLBS_MULTIPLESEL));
   m_pList->SetFontSize(GetCreationParam().fFontSize);
 
   m_bHoverSel = HasFlag(PLBS_HOVERSEL);
 }
 
 void CPWL_ListBox::OnDestroy() {
@@ skipping 363 matching lines @@
                                    uint32_t nFlag) {
   if (zDelta < 0)
     m_pList->OnVK_DOWN(IsSHIFTpressed(nFlag), IsCTRLpressed(nFlag));
   else
     m_pList->OnVK_UP(IsSHIFTpressed(nFlag), IsCTRLpressed(nFlag));
 
   FX_BOOL bExit = FALSE;
   OnNotifySelChanged(FALSE, bExit, nFlag);
   return TRUE;
 }