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

core/fxge/ge/cfx_fontmgr.cpp

 // Copyright 2016 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/cfx_fontmgr.h"
 
 #include "core/fxge/cfx_fontmapper.h"
 #include "core/fxge/cfx_substfont.h"
 #include "core/fxge/fontdata/chromefontdata/chromefontdata.h"
 #include "core/fxge/fx_font.h"
 #include "core/fxge/ge/cttfontdesc.h"
 #include "core/fxge/ifx_systemfontinfo.h"
+#include "third_party/base/ptr_util.h"
 
 namespace {
 
 struct BuiltinFont {
   const uint8_t* m_pFontData;
   uint32_t m_dwSize;
 };
 
 const BuiltinFont g_FoxitFonts[14] = {
     {g_FoxitFixedFontData, 17597},
@@ skipping 49 matching lines @@
     face_index = 0;
   else
     face_index = index;
   return face_index;
 }
 
 }  // namespace
 
 CFX_FontMgr::CFX_FontMgr()
     : m_FTLibrary(nullptr), m_FTLibrarySupportsHinting(false) {
-  m_pBuiltinMapper = WrapUnique(new CFX_FontMapper(this));
+  m_pBuiltinMapper = pdfium::MakeUnique<CFX_FontMapper>(this);
 }
 
 CFX_FontMgr::~CFX_FontMgr() {
   for (const auto& pair : m_FaceMap)
     delete pair.second;
 
   // |m_pBuiltinMapper| references |m_FTLibrary|, so it has to be destroyed
   // first.
   m_pBuiltinMapper.reset();
   FXFT_Done_FreeType(m_FTLibrary);
@@ skipping 155 matching lines @@
     return true;
   }
   index -= FX_ArraySize(g_FoxitFonts);
   if (index < FX_ArraySize(g_MMFonts)) {
     *pFontData = g_MMFonts[index].m_pFontData;
     *size = g_MMFonts[index].m_dwSize;
     return true;
   }
   return false;
 }