mash: Remove ShelfDelegate; move functions to ShelfModel.

ash/shell_delegate.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_SHELL_DELEGATE_H_
 #define ASH_SHELL_DELEGATE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 18 matching lines @@
 namespace ui {
 class MenuModel;
 }
 
 namespace ash {
 
 class AccessibilityDelegate;
 class GPUSupport;
 class PaletteDelegate;
 class SessionStateDelegate;
-class ShelfDelegate;
-class ShelfModel;
 class SystemTrayDelegate;
 struct ShelfItem;
 class WallpaperDelegate;
 class WmShelf;
 class WmWindow;
 
 // Delegate of the Shell.
 class ASH_EXPORT ShellDelegate {
  public:
   // The Shell owns the delegate.
@@ skipping 31 matching lines @@
 
   // Invoked when the user uses Ctrl-Shift-Q to close chrome.
   virtual void Exit() = 0;
 
   // Create a shell-specific keyboard::KeyboardUI
   virtual keyboard::KeyboardUI* CreateKeyboardUI() = 0;
 
   // Opens the |url| in a new browser tab.
   virtual void OpenUrlFromArc(const GURL& url) = 0;
 
-  // Creates a new ShelfDelegate. Shell takes ownership of the returned value.
-  virtual ShelfDelegate* CreateShelfDelegate(ShelfModel* model) = 0;
+  // Functions called when the shelf is initialized and shut down.
+  // TODO(msw): Refine ChromeLauncherControllerImpl lifetime management.
+  virtual void ShelfInit() {}
+  virtual void ShelfShutdown() {}
 
   // Creates a system-tray delegate. Shell takes ownership of the delegate.
   virtual SystemTrayDelegate* CreateSystemTrayDelegate() = 0;
 
   // Creates a wallpaper delegate. Shell takes ownership of the delegate.
   virtual std::unique_ptr<WallpaperDelegate> CreateWallpaperDelegate() = 0;
 
   // Creates a session state delegate. Shell takes ownership of the delegate.
   virtual SessionStateDelegate* CreateSessionStateDelegate() = 0;
 
@@ skipping 30 matching lines @@
   // if both local state and user prefs are enabled, otherwise disabled.
   virtual void UpdateTouchscreenStatusFromPrefs() = 0;
 
   // Toggles the status of touchpad between enabled and disabled.
   virtual void ToggleTouchpad() {}
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_DELEGATE_H_