Removes unnecessary function in WmWindow

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 120 matching lines @@
   virtual void SetBoundsInScreen(const gfx::Rect& bounds_in_screen,
                                  const display::Display& dst_display) = 0;
   virtual gfx::Rect GetBoundsInScreen() const = 0;
   virtual const gfx::Rect& GetBounds() const = 0;
   virtual gfx::Rect GetTargetBounds() = 0;
 
   virtual void ClearRestoreBounds() = 0;
   virtual void SetRestoreBoundsInScreen(const gfx::Rect& bounds) = 0;
   virtual gfx::Rect GetRestoreBoundsInScreen() const = 0;
 
-  virtual void OnWMEvent(const wm::WMEvent* event) = 0;
-
   virtual bool Contains(const WmWindow* other) const = 0;
 
   virtual void SetShowState(ui::WindowShowState show_state) = 0;
   virtual ui::WindowShowState GetShowState() const = 0;
 
   virtual void SetRestoreShowState(ui::WindowShowState show_state) = 0;
 
   // If |value| is true the window can not be moved to another root, regardless
   // of the bounds set on it.
   virtual void SetLockedToRoot(bool value) = 0;
@@ skipping 43 matching lines @@
   virtual void RemoveObserver(WmWindowObserver* observer) = 0;
 
  protected:
   virtual ~WmWindow() {}
 };
 
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_WM_COMMON_WM_WINDOW_H_