Restructure public side of surfaces service.

mojo/services/public/interfaces/surfaces/BUILD.gn

Index: mojo/services/public/interfaces/surfaces/BUILD.gn
diff --git a/mojo/services/public/interfaces/surfaces/BUILD.gn b/mojo/services/public/interfaces/surfaces/BUILD.gn
deleted file mode 100644
index 5d589a0da805e6635fb5f99d5ebb57ddf68ef50b..0000000000000000000000000000000000000000
--- a/mojo/services/public/interfaces/surfaces/BUILD.gn
+++ /dev/null
@@ -1,26 +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/public/tools/bindings/mojom.gni")
-
-mojom("surfaces") {
-  sources = [
-    "quads.mojom",
-    "surfaces.mojom",
-    "surfaces_service.mojom",
-  ]
-
-  deps = [
-    ":surface_id",
-    "//mojo/services/public/interfaces/geometry",
-    "//mojo/services/public/interfaces/gpu",
-    "//mojo/services/public/interfaces/native_viewport",
-  ]
-}
-
-mojom("surface_id") {
-  sources = [
-    "surface_id.mojom",
-  ]
-}