Mus: Delete unused Mandoline Surfaces code

components/mus/public/cpp/surfaces/surfaces_type_converters.h

Index: components/mus/public/cpp/surfaces/surfaces_type_converters.h
diff --git a/components/mus/public/cpp/surfaces/surfaces_type_converters.h b/components/mus/public/cpp/surfaces/surfaces_type_converters.h
index 88f3e53805471315b473998a8b96adc5d03296af..91a151b1e7ac6ec739b17716d9536301f0597ae2 100644
--- a/components/mus/public/cpp/surfaces/surfaces_type_converters.h
+++ b/components/mus/public/cpp/surfaces/surfaces_type_converters.h
@@ -29,8 +29,6 @@ class SharedQuadState;
 
 namespace mojo {
 
-class CustomSurfaceConverter;
-
 // Types from quads.mojom
 template <>
 struct MOJO_SURFACES_EXPORT TypeConverter<cc::mojom::ColorPtr, SkColor> {
@@ -49,8 +47,7 @@ struct MOJO_SURFACES_EXPORT
 
 std::unique_ptr<cc::RenderPass> ConvertToRenderPass(
     const cc::mojom::RenderPassPtr& input,
-    const cc::CompositorFrameMetadata& metadata,
-    CustomSurfaceConverter* custom_converter);
+    const cc::CompositorFrameMetadata& metadata);
 
 template <>
 struct MOJO_SURFACES_EXPORT
@@ -67,8 +64,7 @@ struct MOJO_SURFACES_EXPORT
 
 // Types from compositor_frame.mojom
 MOJO_SURFACES_EXPORT std::unique_ptr<cc::CompositorFrame>
-ConvertToCompositorFrame(const mus::mojom::CompositorFramePtr& input,
-                         CustomSurfaceConverter* custom_converter);
+ConvertToCompositorFrame(const mus::mojom::CompositorFramePtr& input);
 
 template <>
 struct MOJO_SURFACES_EXPORT