Move yet more from WmShell to Shell

ash/aura/wm_shell_aura.h

 // 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.
 
 #ifndef ASH_AURA_WM_SHELL_AURA_H_
 #define ASH_AURA_WM_SHELL_AURA_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 68 matching lines @@
   bool IsTouchDown() override;
   void ToggleIgnoreExternalKeyboard() override;
   void SetLaserPointerEnabled(bool enabled) override;
   void SetPartialMagnifierEnabled(bool enabled) override;
   void CreatePointerWatcherAdapter() override;
   void CreatePrimaryHost() override;
   void InitHosts(const ShellInitParams& init_params) override;
   std::unique_ptr<AcceleratorController> CreateAcceleratorController() override;
 
  private:
-  // SessionStateObserver:
-  void SessionStateChanged(session_manager::SessionState state) override;
-
   // WindowTreeHostManager::Observer:
   void OnDisplayConfigurationChanging() override;
   void OnDisplayConfigurationChanged() override;
 
   std::unique_ptr<PointerWatcherAdapter> pointer_watcher_adapter_;
 
   bool added_display_observer_ = false;
   base::ObserverList<WmDisplayObserver> display_observers_;
 
   std::unique_ptr<AcceleratorControllerDelegateAura>
       accelerator_controller_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(WmShellAura);
 };
 
 }  // namespace ash
 
 #endif  // ASH_AURA_WM_SHELL_AURA_H_