chromeos: Rename ash::WmShelf to Shelf

ash/display/window_tree_host_manager_unittest.cc

 // Copyright (c) 2012 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/window_tree_host_manager.h"
 
 #include <memory>
 
 #include "ash/display/display_util.h"
 #include "ash/screen_util.h"
+#include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_widget.h"
-#include "ash/shelf/wm_shelf.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/test/ash_test_helper.h"
 #include "ash/test/cursor_manager_test_api.h"
 #include "ash/test/test_shell_delegate.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm/wm_event.h"
 #include "base/command_line.h"
 #include "ui/aura/client/focus_change_observer.h"
 #include "ui/aura/client/focus_client.h"
@@ skipping 1674 matching lines @@
       widget->GetNativeWindow()->GetRootWindow());
   event_generator.MoveMouseToCenterOf(widget->GetNativeWindow());
 
   UpdateDisplay("300x300");
   watcher.Stop();
 
   widget->CloseNow();
 }
 
 }  // namespace ash