ash: Remove ash::Shelf in favor of ash::WmShelf

ash/aura/wm_root_window_controller_aura.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/aura/wm_root_window_controller_aura.h"
 
 #include "ash/aura/wm_shelf_aura.h"
 #include "ash/aura/wm_shell_aura.h"
 #include "ash/aura/wm_window_aura.h"
-#include "ash/common/shelf/shelf.h"
 #include "ash/common/shelf/shelf_widget.h"
 #include "ash/common/wm/workspace/workspace_layout_manager_backdrop_delegate.h"
 #include "ash/common/wm/workspace_controller.h"
 #include "ash/common/wm_root_window_controller_observer.h"
 #include "ash/display/window_tree_host_manager.h"
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/aura/window_property.h"
@@ skipping 132 matching lines @@
 void WmRootWindowControllerAura::OnDisplayRemoved(
     const display::Display& display) {}
 
 void WmRootWindowControllerAura::OnDisplayMetricsChanged(
     const display::Display& display,
     uint32_t metrics) {
   FOR_EACH_OBSERVER(WmRootWindowControllerObserver, observers_,
                     OnWorkAreaChanged());
 }
 
-}  // namespace ash
+}  // namespace ash