Makes WorkspaceLayoutManager use ash/wm/common types

components/mus/public/cpp/window.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 COMPONENTS_MUS_PUBLIC_CPP_WINDOW_H_
 #define COMPONENTS_MUS_PUBLIC_CPP_WINDOW_H_
 
 #include <stdint.h>
 #include <vector>
 
@@ skipping 297 matching lines @@
   int local_id_ = -1;
   Window* parent_;
   Children children_;
 
   Window* stacking_target_;
   Window* transient_parent_;
   Children transient_children_;
 
   bool is_modal_;
 
-  base::ObserverList<WindowObserver> observers_;
+  base::ObserverList<WindowObserver, true> observers_;
   InputEventHandler* input_event_handler_;
 
   gfx::Rect bounds_;
   gfx::Insets client_area_;
   std::vector<gfx::Rect> additional_client_areas_;
 
   mojom::ViewportMetricsPtr viewport_metrics_;
 
   bool visible_;
   float opacity_;
@@ skipping 16 matching lines @@
   };
 
   std::map<const void*, Value> prop_map_;
 
   DISALLOW_COPY_AND_ASSIGN(Window);
 };
 
 }  // namespace mus
 
 #endif  // COMPONENTS_MUS_PUBLIC_CPP_WINDOW_H_