Removes WindowState::aura_window()

ash/wm/common/wm_window.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_WM_COMMON_WM_WINDOW_H_
 #define ASH_WM_COMMON_WM_WINDOW_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 155 matching lines @@
 
   virtual void Hide() = 0;
   virtual void Show() = 0;
 
   virtual bool IsFocused() const = 0;
 
   virtual bool IsActive() const = 0;
   virtual void Activate() = 0;
   virtual void Deactivate() = 0;
 
+  virtual void SetFullscreen() = 0;
+
   virtual void Maximize() = 0;
   virtual void Minimize() = 0;
   virtual void Unminimize() = 0;
 
   virtual bool CanMaximize() const = 0;
   virtual bool CanMinimize() const = 0;
   virtual bool CanResize() const = 0;
   virtual bool CanActivate() const = 0;
 
   virtual void StackChildAtTop(WmWindow* child) = 0;
@@ skipping 12 matching lines @@
   virtual void RemoveObserver(WmWindowObserver* observer) = 0;
 
  protected:
   virtual ~WmWindow() {}
 };
 
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_WM_COMMON_WM_WINDOW_H_