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

core/include/fxcrt/fx_basic.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_FXCRT_FX_BASIC_H_
 #define CORE_INCLUDE_FXCRT_FX_BASIC_H_
 
 #include "fx_memory.h"
@@ skipping 937 matching lines @@
 
  private:
   T* const m_Location;
   const T m_OldValue;
 };
 
 struct FxFreeDeleter {
   inline void operator()(void* ptr) const { FX_Free(ptr); }
 };
 
-// Used with nonstd::unique_ptr to Release() objects that can't be deleted.
+// Used with std::unique_ptr to Release() objects that can't be deleted.
 template <class T>
 struct ReleaseDeleter {
   inline void operator()(T* ptr) const { ptr->Release(); }
 };
 
 #define FX_DATALIST_LENGTH 1024
 template <size_t unit>
 class CFX_SortListArray {
  protected:
   struct DataList {
@@ skipping 171 matching lines @@
   FX_FLOAT c;
   FX_FLOAT d;
   FX_FLOAT e;
   FX_FLOAT f;
   FX_FLOAT g;
   FX_FLOAT h;
   FX_FLOAT i;
 };
 
 #endif  // CORE_INCLUDE_FXCRT_FX_BASIC_H_