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Assets/LWRPSupport/LWRPBackgroundRenderPass.cs

 using UnityEngine.Experimental.Rendering.LightweightPipeline;
 using UnityEngine.Rendering;
 
-namespace UnityEngine.XR.ARFoundation.LWRPSupport
+namespace UnityEngine.XR.ARFoundation
 {
     public class LWRPBackgroundRenderPass : ScriptableRenderPass
     {

Assets/LWRPSupport/LWRPBackgroundRenderer.cs

 
-namespace UnityEngine.XR.ARFoundation.LWRPSupport
+namespace UnityEngine.XR.ARFoundation
 {
 
     public class LWRPBackgroundRenderer : ARFoundationBackgroundRenderer

Assets/LWRPSupport/LWRPBackgroundRendererAsset.cs

 using System;
 using UnityEngine.Rendering;
 
-namespace UnityEngine.XR.ARFoundation.LWRPSupport
+namespace UnityEngine.XR.ARFoundation
 {
     [CreateAssetMenu(fileName = "LWRPBackgroundRendererAsset", menuName = "XR/LWRPBackgroundRendererAsset")]
     public class LWRPBackgroundRendererAsset : ARBackgroundRendererAsset

Assets/LWRPSupport/LWRPBeforeCameraRender.cs

 using UnityEngine.Experimental.Rendering;
 using UnityEngine.Experimental.Rendering.LightweightPipeline;
 
-namespace UnityEngine.XR.ARFoundation.LWRPSupport
+namespace UnityEngine.XR.ARFoundation
 {
 	public class LWRPBeforeCameraRender : MonoBehaviour, IBeforeRender
 	{