mash: Remove WmRootWindowControllerObserver.

ash/common/wm_root_window_controller.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_COMMON_WM_ROOT_WINDOW_CONTROLLER_H_
 #define ASH_COMMON_WM_ROOT_WINDOW_CONTROLLER_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/wm/workspace/workspace_types.h"
 #include "base/macros.h"
-#include "base/observer_list.h"
 #include "ui/views/widget/widget.h"
 
 namespace gfx {
 class Point;
 }
 
 namespace ash {
 
 class AlwaysOnTopController;
 class WmShelf;
 class WmShell;
-class WmRootWindowControllerObserver;
 class WmWindow;
 class WorkspaceController;
 
 namespace wm {
 class RootWindowLayoutManager;
 }
 
 // Provides state associated with a root of a window hierarchy.
 class ASH_EXPORT WmRootWindowController {
  public:
   explicit WmRootWindowController(WmWindow* window);
   virtual ~WmRootWindowController();
 
   wm::RootWindowLayoutManager* root_window_layout_manager() {
     return root_window_layout_manager_;
   }
 
   WorkspaceController* workspace_controller() {
     return workspace_controller_.get();
   }
 
   wm::WorkspaceWindowState GetWorkspaceWindowState();
 
-  void AddObserver(WmRootWindowControllerObserver* observer);
-  void RemoveObserver(WmRootWindowControllerObserver* observer);
-
   virtual bool HasShelf() = 0;
 
   virtual WmShell* GetShell() = 0;
 
   virtual AlwaysOnTopController* GetAlwaysOnTopController() = 0;
 
   virtual WmShelf* GetShelf() = 0;
 
   // Returns the window associated with this WmRootWindowController.
   virtual WmWindow* GetWindow() = 0;
@@ skipping 18 matching lines @@
 
  protected:
   // Creates the containers (WmWindows) used by the shell.
   void CreateContainers();
 
   // Creates the LayoutManagers for the windows created by CreateContainers().
   void CreateLayoutManagers();
 
   void DeleteWorkspaceController();
 
-  base::ObserverList<WmRootWindowControllerObserver>* observers() {
-    return &observers_;
-  }
-
  private:
   WmWindow* root_;
 
   wm::RootWindowLayoutManager* root_window_layout_manager_;
 
   std::unique_ptr<WorkspaceController> workspace_controller_;
 
-  base::ObserverList<WmRootWindowControllerObserver> observers_;
-
   DISALLOW_COPY_AND_ASSIGN(WmRootWindowController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_ROOT_WINDOW_CONTROLLER_H_