Avoid the ptr.reset(new XXX()) anti-pattern

xfa/fxfa/app/xfa_fontmgr.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 "xfa/fxfa/xfa_fontmgr.h"
 
 #include <algorithm>
 #include <memory>
 #include <utility>
 
 #include "core/fpdfapi/font/cpdf_font.h"
 #include "core/fpdfapi/parser/cpdf_dictionary.h"
 #include "core/fpdfapi/parser/cpdf_document.h"
+#include "third_party/base/ptr_util.h"
 #include "xfa/fgas/font/cfgas_gefont.h"
 #include "xfa/fxfa/xfa_ffapp.h"
 #include "xfa/fxfa/xfa_ffdoc.h"
 
 namespace {
 
 // The 5 names per entry are: PsName, Normal, Bold, Italic, BoldItalic.
 const char* const g_XFAPDFFontName[][5] = {
     {"Adobe PI Std", "AdobePIStd", "AdobePIStd", "AdobePIStd", "AdobePIStd"},
     {"Myriad Pro Light", "MyriadPro-Light", "MyriadPro-Semibold",
@@ skipping 2014 matching lines @@
       pMgr->SetFont(pFont, pPDFFont);
       pFont->SetFontProvider(pMgr);
     }
     m_FontMap[bsKey] = pFont;
   }
   return pFont;
 }
 
 void CXFA_FontMgr::LoadDocFonts(CXFA_FFDoc* hDoc) {
   if (!m_PDFFontMgrMap[hDoc])
-    m_PDFFontMgrMap[hDoc].reset(new CXFA_PDFFontMgr(hDoc));
+    m_PDFFontMgrMap[hDoc] = pdfium::MakeUnique<CXFA_PDFFontMgr>(hDoc);
 }
 
 void CXFA_FontMgr::ReleaseDocFonts(CXFA_FFDoc* hDoc) {
   m_PDFFontMgrMap.erase(hDoc);
 }
 
 void CXFA_FontMgr::SetDefFontMgr(std::unique_ptr<CXFA_DefFontMgr> pFontMgr) {
   m_pDefFontMgr = std::move(pFontMgr);
 }