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

core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_unittest.cpp

Index: core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_unittest.cpp
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_unittest.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_unittest.cpp
index 3fd8dcf35a600fc1ac533dc6d60e0a08b3f73baa..3014ca280ed54bd1e7c66e559bd0c2195eac46e3 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_unittest.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_unittest.cpp
@@ -97,7 +97,7 @@ class CPDF_TestParser : public CPDF_Parser {
 // TODO(thestig) Using unique_ptr with ReleaseDeleter is still not ideal.
 // Come up or wait for something better.
 using ScopedFileStream =
-    nonstd::unique_ptr<IFX_FileStream, ReleaseDeleter<IFX_FileStream>>;
+    std::unique_ptr<IFX_FileStream, ReleaseDeleter<IFX_FileStream>>;
 
 TEST(fpdf_parser_parser, ReadHexString) {
   {