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

fpdfsdk/formfiller/cffl_textfield.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/formfiller/cffl_textfield.h"
 
 #include "fpdfsdk/cpdfsdk_environment.h"
 #include "fpdfsdk/cpdfsdk_widget.h"
 #include "fpdfsdk/formfiller/cba_fontmap.h"
 #include "fpdfsdk/fsdk_common.h"
+#include "third_party/base/ptr_util.h"
 
 CFFL_TextField::CFFL_TextField(CPDFSDK_Environment* pApp, CPDFSDK_Annot* pAnnot)
     : CFFL_FormFiller(pApp, pAnnot) {}
 
 CFFL_TextField::~CFFL_TextField() {
   for (const auto& it : m_Maps)
     it.second->InvalidateFocusHandler(this);
 
   // See comment in cffl_formfiller.h.
   // The font map should be stored somewhere more appropriate so it will live
@@ skipping 42 matching lines @@
     case BF_ALIGN_MIDDLE:
       cp.dwFlags |= PES_MIDDLE;
       break;
     case BF_ALIGN_RIGHT:
       cp.dwFlags |= PES_RIGHT;
       break;
   }
 
   if (!m_pFontMap) {
     m_pFontMap =
-        WrapUnique(new CBA_FontMap(m_pWidget, m_pEnv->GetSysHandler()));
+        pdfium::MakeUnique<CBA_FontMap>(m_pWidget, m_pEnv->GetSysHandler());
   }
   cp.pFontMap = m_pFontMap.get();
   cp.pFocusHandler = this;
 
   return cp;
 }
 
 CPWL_Wnd* CFFL_TextField::NewPDFWindow(const PWL_CREATEPARAM& cp,
                                        CPDFSDK_PageView* pPageView) {
   CPWL_Edit* pWnd = new CPWL_Edit();
@@ skipping 190 matching lines @@
     pEdit->SetCodePage(936);
 
     pEdit->SetReadyToInput();
     CFX_WideString wsText = pEdit->GetText();
     int nCharacters = wsText.GetLength();
     CFX_ByteString bsUTFText = wsText.UTF16LE_Encode();
     unsigned short* pBuffer = (unsigned short*)bsUTFText.c_str();
     m_pEnv->OnSetFieldInputFocus(pBuffer, nCharacters, TRUE);
   }
 }