Fixs bug in notifying clients about hierarchy changes

ui/aura/mus/window_tree_client.h

 // Copyright 2014 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 UI_AURA_MUS_WINDOW_TREE_CLIENT_H_
 #define UI_AURA_MUS_WINDOW_TREE_CLIENT_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 182 matching lines @@
 
   // See InFlightChange for details on how InFlightChanges are used.
   uint32_t ScheduleInFlightChange(std::unique_ptr<InFlightChange> change);
 
   // Returns true if there is an InFlightChange that matches |change|. If there
   // is an existing change SetRevertValueFrom() is invoked on it. Returns false
   // if there is no InFlightChange matching |change|.
   // See InFlightChange for details on how InFlightChanges are used.
   bool ApplyServerChangeToExistingInFlightChange(const InFlightChange& change);
 
-  void BuildWindowTree(const mojo::Array<ui::mojom::WindowDataPtr>& windows,
-                       WindowMus* initial_parent);
+  void BuildWindowTree(const mojo::Array<ui::mojom::WindowDataPtr>& windows);
 
   // Creates a WindowPortMus from the server side data.
   std::unique_ptr<WindowPortMus> CreateWindowPortMus(
       const ui::mojom::WindowDataPtr& window_data,
       WindowMusType window_mus_type);
 
   // Sets local properties on the associated Window from the server properties.
   void SetLocalPropertiesFromServerProperties(
       WindowMus* window,
       const ui::mojom::WindowDataPtr& window_data);
@@ skipping 295 matching lines @@
   std::unique_ptr<DragDropControllerMus> drag_drop_controller_;
 
   base::WeakPtrFactory<WindowTreeClient> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowTreeClient);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_MUS_WINDOW_TREE_CLIENT_H_