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

core/src/fpdfdoc/doc_bookmark.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 <memory>
 #include <vector>
 
 #include "core/include/fpdfdoc/fpdf_doc.h"
-#include "third_party/base/nonstd_unique_ptr.h"
 
 CPDF_Bookmark CPDF_BookmarkTree::GetFirstChild(
     const CPDF_Bookmark& parent) const {
   if (!parent.m_pDict) {
     CPDF_Dictionary* pRoot = m_pDocument->GetRoot()->GetDict("Outlines");
     if (!pRoot) {
       return CPDF_Bookmark();
     }
     return CPDF_Bookmark(pRoot->GetDict("First"));
   }
@@ skipping 32 matching lines @@
   }
   CPDF_String* pString = ToString(m_pDict->GetElementValue("Title"));
   if (!pString)
     return CFX_WideString();
 
   CFX_WideString title = pString->GetUnicodeText();
   int len = title.GetLength();
   if (!len) {
     return CFX_WideString();
   }
-  nonstd::unique_ptr<FX_WCHAR[]> buf(new FX_WCHAR[len]);
+  std::unique_ptr<FX_WCHAR[]> buf(new FX_WCHAR[len]);
   for (int i = 0; i < len; i++) {
     FX_WCHAR w = title[i];
     buf[i] = w > 0x20 ? w : 0x20;
   }
   return CFX_WideString(buf.get(), len);
 }
 CPDF_Dest CPDF_Bookmark::GetDest(CPDF_Document* pDocument) const {
   if (!m_pDict)
     return CPDF_Dest();
 
   CPDF_Object* pDest = m_pDict->GetElementValue("Dest");
   if (!pDest)
     return CPDF_Dest();
   if (pDest->IsString() || pDest->IsName()) {
     CPDF_NameTree name_tree(pDocument, "Dests");
     CFX_ByteStringC name = pDest->GetString();
     return CPDF_Dest(name_tree.LookupNamedDest(pDocument, name));
   }
   if (CPDF_Array* pArray = pDest->AsArray())
     return CPDF_Dest(pArray);
   return CPDF_Dest();
 }
 CPDF_Action CPDF_Bookmark::GetAction() const {
   if (!m_pDict) {
     return CPDF_Action();
   }
   return CPDF_Action(m_pDict->GetDict("A"));
 }