Remove ISecureCommand / SecureUICommand dead code

Author: h3xds1nz

src/Microsoft.DotNet.Wpf/src/PresentationCore/PresentationCore.csproj

@@ -611,7 +611,6 @@
     <Compile Include="System\Windows\Input\Command\InputBindingCollection.cs" />
     <Compile Include="System\Windows\Input\Command\InputGesture.cs" />
     <Compile Include="System\Windows\Input\Command\InputGestureCollection.cs" />
-    <Compile Include="System\Windows\Input\Command\ISecureCommand.cs" />
     <Compile Include="System\Windows\Input\Command\KeyBinding.cs" />
     <Compile Include="System\Windows\Input\Command\KeyGesture.cs" />
     <Compile Include="System\Windows\Input\Command\KeyGestureConverter.cs" />
@@ -627,7 +626,6 @@
     <Compile Include="System\Windows\Input\Command\NavigationCommands.cs" />
     <Compile Include="System\Windows\Input\Command\RoutedCommand.cs" />
     <Compile Include="System\Windows\Input\Command\RoutedUICommand.cs" />
-    <Compile Include="System\Windows\Input\Command\SecureUICommand.cs" />
     <Compile Include="System\Windows\Input\Stylus\Common\DynamicRenderer.cs" />
     <Compile Include="System\Windows\Input\Stylus\Common\DynamicRendererThreadManager.cs" />
     <Compile Include="System\Windows\Input\Stylus\Common\MultiTouchSystemGestureLogic.cs" />