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

core/fpdfapi/fpdf_font/cpdf_font.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/fpdfapi/fpdf_font/cpdf_font.h"
 
 #include <memory>
 #include <vector>
 
 #include "core/fpdfapi/cpdf_modulemgr.h"
 #include "core/fpdfapi/fpdf_font/cpdf_fontencoding.h"
 #include "core/fpdfapi/fpdf_font/cpdf_truetypefont.h"
 #include "core/fpdfapi/fpdf_font/cpdf_type1font.h"
 #include "core/fpdfapi/fpdf_font/cpdf_type3font.h"
 #include "core/fpdfapi/fpdf_font/font_int.h"
 #include "core/fpdfapi/fpdf_page/cpdf_pagemodule.h"
 #include "core/fpdfapi/fpdf_page/pageint.h"
 #include "core/fpdfapi/fpdf_parser/cpdf_array.h"
 #include "core/fpdfapi/fpdf_parser/cpdf_dictionary.h"
 #include "core/fpdfapi/fpdf_parser/cpdf_document.h"
 #include "core/fpdfapi/fpdf_parser/cpdf_name.h"
 #include "core/fpdfapi/fpdf_parser/cpdf_stream_acc.h"
 #include "core/fxcrt/fx_memory.h"
 #include "core/fxge/fx_freetype.h"
+#include "third_party/base/ptr_util.h"
 #include "third_party/base/stl_util.h"
 
 namespace {
 
 const uint8_t kChineseFontNames[][5] = {{0xCB, 0xCE, 0xCC, 0xE5, 0x00},
                                         {0xBF, 0xAC, 0xCC, 0xE5, 0x00},
                                         {0xBA, 0xDA, 0xCC, 0xE5, 0x00},
                                         {0xB7, 0xC2, 0xCB, 0xCE, 0x00},
                                         {0xD0, 0xC2, 0xCB, 0xCE, 0x00}};
 
@@ skipping 410 matching lines @@
     return charnames[charcode].c_str();
 
   const FX_CHAR* name = nullptr;
   if (iBaseEncoding)
     name = PDF_CharNameFromPredefinedCharSet(iBaseEncoding, charcode);
   return name && name[0] ? name : nullptr;
 }
 
 uint32_t CPDF_Font::FallbackFontFromCharcode(uint32_t charcode) {
   if (m_FontFallbacks.empty()) {
-    m_FontFallbacks.push_back(WrapUnique(new CFX_Font()));
+    m_FontFallbacks.push_back(pdfium::MakeUnique<CFX_Font>());
     m_FontFallbacks[0]->LoadSubst("Arial", IsTrueTypeFont(), m_Flags,
                                   m_StemV * 5, m_ItalicAngle, 0,
                                   IsVertWriting());
   }
   return 0;
 }
 
 int CPDF_Font::FallbackGlyphFromCharcode(int fallbackFont, uint32_t charcode) {
   if (fallbackFont < 0 ||
       fallbackFont >= pdfium::CollectionSize<int>(m_FontFallbacks)) {
     return -1;
   }
   int glyph =
       FXFT_Get_Char_Index(m_FontFallbacks[fallbackFont]->GetFace(), charcode);
   if (glyph == 0 || glyph == 0xffff)
     return -1;
   return glyph;
 }