Fix copyright header

ash/display/root_window_transformers.cc

-// Copyright 2013 The Chromium Authors. All rights reserved.
+// Copyright (c) 2013 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 "ash/display/root_window_transformers.h"
 
 #include <cmath>
 
 #include "ash/display/display_info.h"
 #include "ash/display/display_manager.h"
 #include "ash/magnifier/magnification_controller.h"
@@ skipping 255 matching lines @@
 
 aura::RootWindowTransformer* CreateRootWindowTransformerForMirroredDisplay(
     const DisplayInfo& source_display_info,
     const DisplayInfo& mirror_display_info) {
   return new MirrorRootWindowTransformer(source_display_info,
                                          mirror_display_info);
 }
 
 }  // namespace internal
 }  // namespace ash