WIP: Propagate SurfaceID up window tree hierarchy

services/ui/surfaces/surfaces_state.cc

Index: services/ui/surfaces/surfaces_state.cc
diff --git a/services/ui/surfaces/surfaces_state.cc b/services/ui/surfaces/surfaces_state.cc
deleted file mode 100644
index edb1e8ecee7e7ce2df807aa47b3b6f79ce25533f..0000000000000000000000000000000000000000
--- a/services/ui/surfaces/surfaces_state.cc
+++ /dev/null
@@ -1,13 +0,0 @@
-// Copyright 2015 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.
-
-#include "services/ui/surfaces/surfaces_state.h"
-
-namespace ui {
-
-SurfacesState::SurfacesState() : next_client_id_(1u) {}
-
-SurfacesState::~SurfacesState() {}
-
-}  // namespace ui