Cleanup ash shelf accessor functions.

ash/root_window_controller.h

 // Copyright (c) 2012 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_ROOT_WINDOW_CONTROLLER_H_
 #define ASH_ROOT_WINDOW_CONTROLLER_H_
 
 #include <map>
 
 #include "ash/ash_export.h"
@@ skipping 67 matching lines @@
 // its property (RootWindowSettings) and can be obtained using
 // |GetRootWindowController(aura::WindowEventDispatcher*)| function.
 class ASH_EXPORT RootWindowController : public ShellObserver {
  public:
   // Creates and Initialize the RootWindowController for primary display.
   static void CreateForPrimaryDisplay(AshWindowTreeHost* host);
 
   // Creates and Initialize the RootWindowController for secondary displays.
   static void CreateForSecondaryDisplay(AshWindowTreeHost* host);
 
-  // Returns a RootWindowController that has a shelf for given
-  // |window|. This returns the RootWindowController for the |window|'s
-  // root window when multiple shelf mode is enabled, or the primary
-  // RootWindowController otherwise.
-  static RootWindowController* ForShelf(const aura::Window* window);
-
   // Returns a RootWindowController of the window's root window.
   static RootWindowController* ForWindow(const aura::Window* window);
 
   // Returns the RootWindowController of the target root window.
   static RootWindowController* ForTargetRootWindow();
 
   // Returns container which contains a given |window|.
   static aura::Window* GetContainerForWindow(aura::Window* window);
 
   ~RootWindowController() override;
@@ skipping 208 matching lines @@
 };
 
 
 // Gets the RootWindowController for |root_window|.
 ASH_EXPORT RootWindowController* GetRootWindowController(
     const aura::Window* root_window);
 
 }  // namespace ash
 
 #endif  // ASH_ROOT_WINDOW_CONTROLLER_H_