Restructure public side of surfaces service.

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

Index: mojo/services/public/cpp/surfaces/BUILD.gn
diff --git a/mojo/services/public/cpp/surfaces/BUILD.gn b/mojo/services/public/cpp/surfaces/BUILD.gn
deleted file mode 100644
index 02e2d30c94e02aabd78896fab1524dc81da33175..0000000000000000000000000000000000000000
--- a/mojo/services/public/cpp/surfaces/BUILD.gn
+++ /dev/null
@@ -1,15 +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.
-
-source_set("surfaces") {
-  sources = [
-    "surfaces_utils.cc",
-    "surfaces_utils.h",
-  ]
-
-  deps = [
-    "//mojo/services/public/interfaces/geometry",
-    "//mojo/services/public/interfaces/surfaces",
-  ]
-}