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

core/src/fpdfapi/fpdf_page/pageint.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_SRC_FPDFAPI_FPDF_PAGE_PAGEINT_H_
 #define CORE_SRC_FPDFAPI_FPDF_PAGE_PAGEINT_H_
 
 #include <map>
+#include <memory>
 
 #include "core/include/fpdfapi/fpdf_page.h"
 #include "core/include/fpdfapi/fpdf_pageobj.h"
-#include "third_party/base/nonstd_unique_ptr.h"
 
 class CPDF_AllStates;
 class CPDF_ParseOptions;
 
 #define PARSE_STEP_LIMIT 100
 
 class CPDF_StreamParser {
  public:
   CPDF_StreamParser(const uint8_t* pData, FX_DWORD dwSize);
   ~CPDF_StreamParser();
@@ skipping 287 matching lines @@
   CPDF_Dictionary* m_pResources;
   CPDF_PageObjects* m_pObjectList;
   int m_Level;
   CFX_Matrix m_mtContentToUser;
   CFX_FloatRect m_BBox;
   CPDF_ParseOptions m_Options;
   _ContentParam m_ParamBuf1[PARAM_BUF_SIZE];
   FX_DWORD m_ParamStartPos;
   FX_DWORD m_ParamCount;
   CPDF_StreamParser* m_pSyntax;
-  nonstd::unique_ptr<CPDF_AllStates> m_pCurStates;
+  std::unique_ptr<CPDF_AllStates> m_pCurStates;
   CPDF_ContentMark m_CurContentMark;
   CFX_ArrayTemplate<CPDF_TextObject*> m_ClipTextList;
   CPDF_TextObject* m_pLastTextObject;
   FX_FLOAT m_DefFontSize;
   int m_CompatCount;
   FX_PATHPOINT* m_pPathPoints;
   int m_PathPointCount;
   int m_PathAllocSize;
   FX_FLOAT m_PathStartX;
   FX_FLOAT m_PathStartY;
@@ skipping 186 matching lines @@
                  FX_FLOAT& G,
                  FX_FLOAT& B) const override;
   CPDF_ColorSpace* GetBaseCS() const override;
 
  private:
   CPDF_ColorSpace* m_pBaseCS;
   CPDF_CountedColorSpace* m_pCountedBaseCS;
 };
 
 #endif  // CORE_SRC_FPDFAPI_FPDF_PAGE_PAGEINT_H_