Delete the Surfaces service.

examples/surfaces_app/child.mojom

Index: examples/surfaces_app/child.mojom
diff --git a/examples/surfaces_app/child.mojom b/examples/surfaces_app/child.mojom
deleted file mode 100644
index 78392d070eabfc0efbdc2fae6462bccd27ba7840..0000000000000000000000000000000000000000
--- a/examples/surfaces_app/child.mojom
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import "mojo/services/geometry/interfaces/geometry.mojom";
-import "mojo/services/surfaces/interfaces/quads.mojom";
-import "mojo/services/surfaces/interfaces/surface_id.mojom";
-
-[ServiceName="Child"]
-interface Child {
-  ProduceFrame(mojo.Color color, mojo.Size size) =>
-      (mojo.SurfaceId id);
-};