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

core/include/fpdfdoc/fpdf_doc.h

 // 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
 
 #ifndef CORE_INCLUDE_FPDFDOC_FPDF_DOC_H_
 #define CORE_INCLUDE_FPDFDOC_FPDF_DOC_H_
 
 #include <map>
+#include <memory>
 #include <vector>
 
 #include "core/include/fpdfapi/fpdf_parser.h"
 #include "core/include/fpdfapi/fpdf_render.h"
-#include "third_party/base/nonstd_unique_ptr.h"
 
 class CFieldTree;
 class CPDF_AAction;
 class CPDF_Action;
 class CPDF_ActionFields;
 class CPDF_Annot;
 class CPDF_AnnotList;
 class CPDF_ApSettings;
 class CPDF_Bookmark;
 class CPDF_BookmarkTree;
@@ skipping 667 matching lines @@
                        const CFX_ByteString& name2);
 
   CPDF_Document* const m_pDocument;
 
   FX_BOOL m_bGenerateAP;
 
   CPDF_Dictionary* m_pFormDict;
 
   std::map<const CPDF_Dictionary*, CPDF_FormControl*> m_ControlMap;
 
-  nonstd::unique_ptr<CFieldTree> m_pFieldTree;
+  std::unique_ptr<CFieldTree> m_pFieldTree;
 
   CFX_ByteString m_bsEncoding;
 
   CPDF_FormNotify* m_pFormNotify;
 
   FX_BOOL m_bUpdated;
   friend class CPDF_FormControl;
   friend class CPDF_FormField;
 };
 #define FORMFIELD_READONLY 0x01
@@ skipping 339 matching lines @@
 };
 
 class CPDF_Metadata {
  public:
   explicit CPDF_Metadata(CPDF_Document* pDoc);
   ~CPDF_Metadata();
 
   const CXML_Element* GetRoot() const;
 
  private:
-  nonstd::unique_ptr<CXML_Element> m_pXmlElement;
+  std::unique_ptr<CXML_Element> m_pXmlElement;
 };
 
 class CPDF_ViewerPreferences {
  public:
   explicit CPDF_ViewerPreferences(CPDF_Document* pDoc);
 
   ~CPDF_ViewerPreferences();
 
   FX_BOOL IsDirectionR2L() const;
 
@@ skipping 70 matching lines @@
   CFX_WideString GetCaption(const CFX_ByteStringC& csEntry) const;
 
   CPDF_Stream* GetIcon(const CFX_ByteStringC& csEntry) const;
 
   CPDF_Dictionary* const m_pDict;
 };
 
 CFX_WideString FILESPEC_EncodeFileName(const CFX_WideStringC& filepath);
 
 #endif  // CORE_INCLUDE_FPDFDOC_FPDF_DOC_H_