1 files changed, 3 insertions, 3 deletions
diff --git a/src/mscorlib/src/System/Runtime/InteropServices/WindowsRuntime/CustomPropertyImpl.cs b/src/mscorlib/src/System/Runtime/InteropServices/WindowsRuntime/CustomPropertyImpl.cs
index 04fe1bf9b2..d575201bb9 100644
--- a/src/mscorlib/src/System/Runtime/InteropServices/WindowsRuntime/CustomPropertyImpl.cs
+++ b/src/mscorlib/src/System/Runtime/InteropServices/WindowsRuntime/CustomPropertyImpl.cs
@@ -7,6 +7,7 @@
 using System;
 using System.Security;
 using System.Reflection;
+using System.Diagnostics;
 using System.Diagnostics.Contracts;
 using System.Runtime.InteropServices;
 using System.Runtime.CompilerServices;
@@ -29,7 +30,7 @@ namespace System.Runtime.InteropServices.WindowsRuntime
         public CustomPropertyImpl(PropertyInfo propertyInfo)
         {
             if (propertyInfo == null)
-                throw new ArgumentNullException("propertyInfo");
+                throw new ArgumentNullException(nameof(propertyInfo));
 
             m_property = propertyInfo;
         }
@@ -88,7 +89,6 @@ namespace System.Runtime.InteropServices.WindowsRuntime
             InvokeInternal(target, new object[] { indexValue, value }, false);
         }
 
-        [SecuritySafeCritical]
         private object InvokeInternal(object target, object[] args, bool getValue)
         {
             // Forward to the right object if we are dealing with a proxy
@@ -123,7 +123,7 @@ namespace System.Runtime.InteropServices.WindowsRuntime
 
             // We can safely skip access check because this is only used in full trust scenarios.
             // And we have already verified that the property accessor is public.
-            Contract.Assert(AppDomain.CurrentDomain.PermissionSet.IsUnrestricted());
+            Debug.Assert(AppDomain.CurrentDomain.PermissionSet.IsUnrestricted());
             return rtMethod.UnsafeInvoke(target, BindingFlags.Default, null, args, null);
         }