Move services code brought in from Mojo to live under //third_party.

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

Index: mojo/services/surfaces/public/cpp/BUILD.gn
diff --git a/mojo/services/surfaces/public/cpp/BUILD.gn b/mojo/services/surfaces/public/cpp/BUILD.gn
deleted file mode 100644
index ddac4f3527746482690438505a476cbffc6eca4f..0000000000000000000000000000000000000000
--- a/mojo/services/surfaces/public/cpp/BUILD.gn
+++ /dev/null
@@ -1,20 +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_sdk_root.gni")
-import("$mojo_sdk_root/mojo/public/mojo_sdk.gni")
-
-mojo_sdk_source_set("cpp") {
-  restrict_external_deps = false
-  public_configs = [ "../../../public/build/config:mojo_services" ]
-  sources = [
-    "surfaces_utils.cc",
-    "surfaces_utils.h",
-  ]
-
-  deps = [
-    "../../../geometry/public/interfaces",
-    "../../../surfaces/public/interfaces",
-  ]
-}