Rename StackingClient -> WindowTreeClient

ui/aura/window.h

Index: ui/aura/window.h
diff --git a/ui/aura/window.h b/ui/aura/window.h
index 2db73c37fc91c8446eb228836e200c27a3b09fed..9cddb6cb54b9e7764e0eed54986f19f976a5f1b3 100644
--- a/ui/aura/window.h
+++ b/ui/aura/window.h
@@ -159,13 +159,6 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
   // Marks the a portion of window as needing to be painted.
   void SchedulePaintInRect(const gfx::Rect& rect);
 
-  // Places this window per |root_window|'s stacking client. The final location
-  // may be a RootWindow other than the one passed in. |root_window| may not be
-  // NULL. |bounds_in_screen| may be empty; it is more optional context that
-  // may, but isn't necessarily used.
-  void SetDefaultParentByRootWindow(RootWindow* root_window,
-                                    const gfx::Rect& bounds_in_screen);
-
   // Stacks the specified child of this Window at the front of the z-order.
   void StackChildAtTop(Window* child);