Removes some dead code and includes

ash/mus/test/ash_test_impl_mus.cc

 // Copyright 2016 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/mus/test/ash_test_impl_mus.h"
 
 #include "ash/common/test/ash_test.h"
 #include "ash/mus/bridge/wm_window_mus.h"
 #include "base/memory/ptr_util.h"
 #include "services/ui/public/cpp/property_type_converters.h"
-#include "services/ui/public/cpp/window.h"
-#include "services/ui/public/cpp/window_property.h"
 #include "services/ui/public/interfaces/window_manager.mojom.h"
 #include "ui/wm/core/window_util.h"
 
 namespace ash {
 namespace mus {
 namespace {
 
 // WmTestBase is abstract as TestBody() is pure virtual (the various TEST
 // macros have the implementation). In order to create WmTestBase we have to
 // subclass with an empty implementation of TestBody(). That's ok as the class
@@ skipping 80 matching lines @@
 }
 
 }  // namespace mus
 
 // static
 std::unique_ptr<AshTestImpl> AshTestImpl::Create() {
   return base::MakeUnique<mus::AshTestImplMus>();
 }
 
 }  // namespace ash