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

core/include/fxcrt/fx_basic.h

Index: core/include/fxcrt/fx_basic.h
diff --git a/core/include/fxcrt/fx_basic.h b/core/include/fxcrt/fx_basic.h
index 52d0f14771fcb5806ab9ccc75beceaff2d54b850..2e9723de1d5bda82a43b1f2092b94020f969e916 100644
--- a/core/include/fxcrt/fx_basic.h
+++ b/core/include/fxcrt/fx_basic.h
@@ -1060,7 +1060,7 @@ 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(); }