Address post-merge using issues

Author: h3xds1nz

src/Microsoft.DotNet.Wpf/src/PresentationCore/System/Windows/InterOp/HwndSourceParameters.cs

@@ -1,10 +1,10 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
 
-using MS.Win32;
-using System.Windows.Media;
 using System.Windows.Input;
+using System.Reflection;
+using MS.Internal;
+using MS.Win32;
 
 namespace System.Windows.Interop
 {

src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Markup/Baml2006/Baml2006Reader.cs

@@ -12,6 +12,7 @@
 using System.Globalization;
 using XamlReaderHelper = System.Windows.Markup.XamlReaderHelper;
 using System.Runtime.CompilerServices;
+using MS.Internal;
 
 namespace System.Windows.Baml2006
 {

src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Markup/Primitives/MarkupWriter.cs

@@ -1,17 +1,17 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
 
 //
 //  Contents:  XAML writer
 //
 
+using System.Xml.Serialization;
 using System.ComponentModel;
-using System.Reflection;
 using System.Collections;
+using System.Reflection;
+using MS.Internal;
 using System.Text;
 using System.Xml;
-using System.Xml.Serialization;
 
 namespace System.Windows.Markup.Primitives
 {

src/Microsoft.DotNet.Wpf/src/Shared/MS/Internal/ReflectionUtils.cs

@@ -16,7 +16,6 @@ namespace MS.Internal
     /// </summary>
     internal static class ReflectionUtils
     {
-
 #if !NETFX
         /// <summary>
         ///  Retrieves the full assembly name by combining the <paramref name="partialName"/> passed in

src/Microsoft.DotNet.Wpf/src/WindowsBase/System/Windows/SplashScreen.cs

@@ -53,7 +53,7 @@ public SplashScreen(Assembly resourceAssembly, string resourceName)
             }
 
             _resourceName = resourceName.ToLowerInvariant();
-            _hInstance = Marshal.GetHINSTANCE(resourceAssembly.ManifestModule);
+            _hInstance = (HINSTANCE)Marshal.GetHINSTANCE(resourceAssembly.ManifestModule);
             _resourceManager = new ResourceManager($"{ReflectionUtils.GetAssemblyPartialName(resourceAssembly)}.g", resourceAssembly);
         }