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

core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp

Index: core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
diff --git a/core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp b/core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
index 9c96a3027c1856ff69cc9ffd96308449579231c6..e1c39fbb1604f1336e3290b90ec51e30244bb67a 100644
--- a/core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
+++ b/core/src/fpdfapi/fpdf_edit/fpdf_edit_doc.cpp
@@ -846,7 +846,7 @@ CPDF_Font* CPDF_Document::AddFont(CFX_Font* pFont, int charset, FX_BOOL bVert) {
   }
   CPDF_Dictionary* pBaseDict = new CPDF_Dictionary;
   pBaseDict->SetAtName("Type", "Font");
-  nonstd::unique_ptr<CFX_UnicodeEncoding> pEncoding(
+  std::unique_ptr<CFX_UnicodeEncoding> pEncoding(
       new CFX_UnicodeEncoding(pFont));
   CPDF_Dictionary* pFontDict = pBaseDict;
   if (!bCJK) {