Removed coreutils unused method

ScriptableRenderPipeline/Core/CoreUtils.cs

                 cmd.ClearRenderTarget((clearFlag & ClearFlag.Depth) != 0, (clearFlag & ClearFlag.Color) != 0, clearColor);
         }
 
-        public static void SampleCopyChannel_xyzw2x(CommandBuffer cmd, RenderTargetIdentifier source, RenderTargetIdentifier target, Vector2 size, RenderPipelineResources resources)
-        {
-            var s = new Vector4(size.x, size.y, 1f / size.x, 1f / size.y);
-            cmd.SetComputeVectorParam(resources.copyChannelCS, HDShaderIDs._Size, s);
-            cmd.SetComputeTextureParam(resources.copyChannelCS, resources.copyChannelKernel_xyzw2x, HDShaderIDs._Source4, source);
-            cmd.SetComputeTextureParam(resources.copyChannelCS, resources.copyChannelKernel_xyzw2x, HDShaderIDs._Result1, target);
-            cmd.DispatchCompute(resources.copyChannelCS, resources.copyChannelKernel_xyzw2x, (int)(size.x) / 8, (int)(size.y) / 8, 1);
-        }
-
         public static void ClearCubemap(CommandBuffer cmd, RenderTargetIdentifier buffer, Color clearColor)
         {
             for(int i = 0; i < 6; ++i)