[mus+ash] Removes WmWindow from RootWindowcontroller implementation

ash/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_WINDOW_H_
 #define ASH_WM_WINDOW_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 69 matching lines @@
   // null.
   static aura::Window* GetAuraWindow(WmWindow* wm_window) {
     return const_cast<aura::Window*>(
         GetAuraWindow(const_cast<const WmWindow*>(wm_window)));
   }
   static const aura::Window* GetAuraWindow(const WmWindow* wm_window);
 
   aura::Window* aura_window() { return window_; }
   const aura::Window* aura_window() const { return window_; }
 
-  // See description of |children_use_extended_hit_region_|.
-  bool ShouldUseExtendedHitRegion() const;
-
   void Destroy();
 
   WmWindow* GetRootWindow() {
     return const_cast<WmWindow*>(
         const_cast<const WmWindow*>(this)->GetRootWindow());
   }
   const WmWindow* GetRootWindow() const;
   RootWindowController* GetRootWindowController();
 
   // See shell_window_ids.h for list of known ids.
@@ skipping 169 matching lines @@
   void SetBoundsInScreenBehaviorForChildren(BoundsInScreenBehavior behavior);
 
   // See description of SnapToPixelBoundaryIfNecessary().
   void SetSnapsChildrenToPhysicalPixelBoundary();
 
   // If an ancestor has been set to snap children to pixel boundaries, then
   // snaps the layer associated with this window to the layer associated with
   // the ancestor.
   void SnapToPixelBoundaryIfNecessary();
 
-  // Makes the hit region for children slightly larger for easier resizing.
-  void SetChildrenUseExtendedHitRegion();
-
   void AddTransientWindowObserver(WmTransientWindowObserver* observer);
   void RemoveTransientWindowObserver(WmTransientWindowObserver* observer);
 
  private:
   explicit WmWindow(aura::Window* window);
 
   // ::wm::TransientWindowObserver overrides:
   void OnTransientChildAdded(aura::Window* window,
                              aura::Window* transient) override;
   void OnTransientChildRemoved(aura::Window* window,
                                aura::Window* transient) override;
 
   aura::Window* window_;
 
   bool added_transient_observer_ = false;
   base::ObserverList<WmTransientWindowObserver> transient_observers_;
 
-  // If true child windows should get a slightly larger hit region to make
-  // resizing easier.
-  bool children_use_extended_hit_region_ = false;
-
   DISALLOW_COPY_AND_ASSIGN(WmWindow);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_WINDOW_H_