Make aura work with mus

ui/aura/mus/window_tree_client_delegate.cc

Index: ui/aura/mus/window_tree_client_delegate.cc
diff --git a/services/ui/public/cpp/window_tree_client_delegate.cc b/ui/aura/mus/window_tree_client_delegate.cc
similarity index 69%
copy from services/ui/public/cpp/window_tree_client_delegate.cc
copy to ui/aura/mus/window_tree_client_delegate.cc
index 7e3703a867181011721a4eb768f650cf7feabc8b..90777c43aca43c49d856e79f7ad9725fd7e52227 100644
--- a/services/ui/public/cpp/window_tree_client_delegate.cc
+++ b/ui/aura/mus/window_tree_client_delegate.cc
@@ -2,10 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "services/ui/public/cpp/window_tree_client_delegate.h"
+#include "ui/aura/mus/window_tree_client_delegate.h"
 
-namespace ui {
+namespace aura {
 
 void WindowTreeClientDelegate::OnUnembed(Window* root) {}
 
-}  // namespace ui
+}  // namespace aura