Switch from nonstd::unique_ptr to std::unique_ptr.

fpdfsdk/src/fpdfppo.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 "public/fpdf_ppo.h"
 
+#include <memory>
+
 #include "fpdfsdk/include/fsdk_define.h"
-#include "third_party/base/nonstd_unique_ptr.h"
 
 class CPDF_PageOrganizer {
  public:
   using ObjectNumberMap = std::map<FX_DWORD, FX_DWORD>;
   CPDF_PageOrganizer();
   ~CPDF_PageOrganizer();
 
   FX_BOOL PDFDocInit(CPDF_Document* pDestPDFDoc, CPDF_Document* pSrcPDFDoc);
   FX_BOOL ExportPage(CPDF_Document* pSrcPDFDoc,
                      CFX_WordArray* nPageNum,
@@ skipping 63 matching lines @@
 
   return TRUE;
 }
 
 FX_BOOL CPDF_PageOrganizer::ExportPage(CPDF_Document* pSrcPDFDoc,
                                        CFX_WordArray* nPageNum,
                                        CPDF_Document* pDestPDFDoc,
                                        int nIndex) {
   int curpage = nIndex;
 
-  nonstd::unique_ptr<ObjectNumberMap> pObjNumberMap(new ObjectNumberMap);
+  std::unique_ptr<ObjectNumberMap> pObjNumberMap(new ObjectNumberMap);
 
   for (int i = 0; i < nPageNum->GetSize(); ++i) {
     CPDF_Dictionary* pCurPageDict = pDestPDFDoc->CreateNewPage(curpage);
     CPDF_Dictionary* pSrcPageDict = pSrcPDFDoc->GetPage(nPageNum->GetAt(i) - 1);
     if (!pSrcPageDict || !pCurPageDict)
       return FALSE;
 
     // Clone the page dictionary
     FX_POSITION SrcPos = pSrcPageDict->GetStartPos();
     while (SrcPos) {
@@ skipping 293 matching lines @@
   if (!pSrcDict)
     return FALSE;
 
   CPDF_Dictionary* pDstDict = pDstDoc->GetRoot();
   if (!pDstDict)
     return FALSE;
 
   pDstDict->SetAt("ViewerPreferences", pSrcDict->Clone(TRUE));
   return TRUE;
 }