Moving System.Security.Permissions Types from WPF

src/System.Security.Permissions/src/System/Security/Permissions/MediaPermission.cs

@@ -25,6 +25,7 @@ public enum MediaPermissionImage
         AllImage,
     }
     [Serializable()]
+    [System.Runtime.CompilerServices.TypeForwardedFrom("WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35")]
     sealed public class MediaPermission : CodeAccessPermission, IUnrestrictedPermission
     {
         public MediaPermission() { }

src/System.Security.Permissions/src/System/Security/Permissions/WebBrowserPermission.cs

@@ -11,6 +11,7 @@ public enum WebBrowserPermissionLevel
     }
 
     [Serializable()]
+    [System.Runtime.CompilerServices.TypeForwardedFrom("WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35")]
     sealed public class WebBrowserPermission : CodeAccessPermission, IUnrestrictedPermission
     {
         public WebBrowserPermission() { }

src/System.Security.Permissions/src/System/Xaml/Permissions/XamlAccessLevel.cs

@@ -8,6 +8,7 @@
 namespace System.Xaml.Permissions
 {
     [Serializable]
+    [System.Runtime.CompilerServices.TypeForwardedFrom("System.Xaml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35")]
     public class XamlAccessLevel
     {
         private XamlAccessLevel(string assemblyName, string typeName)

src/System.Security.Permissions/src/System/Xaml/Permissions/XamlLoadPermission.cs

@@ -11,13 +11,14 @@
 namespace System.Xaml.Permissions
 {
     [Serializable]
+    [System.Runtime.CompilerServices.TypeForwardedFrom("System.Xaml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35")]
     public sealed class XamlLoadPermission : CodeAccessPermission, IUnrestrictedPermission
     {
         public XamlLoadPermission(PermissionState state) { }
         public XamlLoadPermission(XamlAccessLevel allowedAccess) { }
         public XamlLoadPermission(IEnumerable<XamlAccessLevel> allowedAccess) { }
         [ComVisible(false)]
-        public override bool Equals(object obj) { return false; }
+        public override bool Equals(object obj) { return ReferenceEquals(this, obj); }
         [ComVisible(false)]
         public override int GetHashCode() { return base.GetHashCode(); }
         public IList<XamlAccessLevel> AllowedAccess { get; private set; } = new ReadOnlyCollection<XamlAccessLevel>(Array.Empty<XamlAccessLevel>());