Remove SRPMARKER reference as it doesn't exist anymore

com.unity.render-pipelines.core/CoreRP/Editor/IncludePaths/CoreShaderIncludePaths.cs

         [ShaderIncludePath]
         public static string[] GetPaths()
         {
-            var srpMarker = Directory.GetFiles(Application.dataPath, "SRPMARKER", SearchOption.AllDirectories).FirstOrDefault();
-            var paths = new string[srpMarker == null ? 1 : 2];
-            var index = 0;
-            if (srpMarker != null)
-            {
-                var rootPath = Directory.GetParent(srpMarker).ToString();
-                paths[index] = Path.Combine(rootPath, "ScriptableRenderPipeline/Core");
-                index++;
-            }
-            paths[index] = Path.GetFullPath("Packages/com.unity.render-pipelines.core");
+            var paths = new string[1];
+            paths[0] = Path.GetFullPath("Packages/com.unity.render-pipelines.core");
             return paths;
         }
     }

com.unity.render-pipelines.high-definition/HDRP/Editor/HDEditorUtils.cs

             { "HDRenderPipeline/Decal", DecalUI.SetupMaterialKeywordsAndPass }
         };
 
-        // Note: This function returns null if used with a package setup.
-        static string GetScriptableRenderPipelinePath()
-        {
-            // User can create their own directory for SRP, so we need to find the current path that they use.
-            // We do that using the SRPMARKER file.
-            var srpMarkerPath = Directory.GetFiles(Application.dataPath, "SRPMARKER", SearchOption.AllDirectories).FirstOrDefault();
-            if (srpMarkerPath != null)
-                return new Uri(Application.dataPath).MakeRelativeUri(new Uri(Directory.GetParent(srpMarkerPath).ToString())).ToString();
-            return null;
-        }
-
-            var srpPath = GetScriptableRenderPipelinePath();
-            if (srpPath != null)
-                return Path.Combine(srpPath, "ScriptableRenderPipeline/HDRenderPipeline/HDRP/");
-            // If the SRPMARKER is not found, we assume that a package setup is used.
-            var srpPath = GetScriptableRenderPipelinePath();
-            if (srpPath != null)
-                return Path.Combine(srpPath, "PostProcessing/PostProcessing/");
-            // If the SRPMARKER is not found, we assume that a package setup is used.
-            var srpPath = GetScriptableRenderPipelinePath();
-            if (srpPath != null)
-                return Path.Combine(srpPath, "ScriptableRenderPipeline/Core/CoreRP/");
-            // If the SRPMARKER is not found, we assume that a package setup is used.
             return "Packages/com.unity.render-pipelines.core/CoreRP/";
         }
 

com.unity.render-pipelines.high-definition/HDRP/Editor/HDShaderIncludePaths.cs

         [ShaderIncludePath]
         public static string[] GetPaths()
         {
-            var srpMarker = Directory.GetFiles(Application.dataPath, "SRPMARKER", SearchOption.AllDirectories).FirstOrDefault();
-            var paths = new string[srpMarker == null ? 1 : 2];
-            var index = 0;
-            if (srpMarker != null)
-            {
-                var rootPath = Directory.GetParent(srpMarker).ToString();
-                paths[index] = Path.Combine(rootPath, "ScriptableRenderPipeline/HDRenderPipeline");
-                index++;
-            }
-            paths[index] = Path.GetFullPath("Packages/com.unity.render-pipelines.high-definition");
+            var paths = new string[1];
+            paths[0] = Path.GetFullPath("Packages/com.unity.render-pipelines.high-definition");
             return paths;
         }
     }

com.unity.render-pipelines.lightweight/LWRP/Editor/LightweightShaderIncludePaths.cs

         [ShaderIncludePath]
         public static string[] GetPaths()
         {
-            var srpMarker = Directory.GetFiles(Application.dataPath, "SRPMARKER", SearchOption.AllDirectories).FirstOrDefault();
-            var paths = new string[srpMarker == null ? 1 : 2];
-            var index = 0;
-            if (srpMarker != null)
-            {
-                var rootPath = Directory.GetParent(srpMarker).ToString();
-                paths[index] = Path.Combine(rootPath, "ScriptableRenderPipeline/LightweightPipeline");
-                index++;
-            }
-            paths[index] = Path.GetFullPath("Packages/com.unity.render-pipelines.lightweight");
+            var paths = new string[1];
+            paths[0] = Path.GetFullPath("Packages/com.unity.render-pipelines.lightweight");
             return paths;
         }
     }