mash: Move ownership of ShelfDelegate to WmShell

ash/common/shelf/shelf_delegate.h

 // Copyright 2013 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_SHELF_SHELF_DELEGATE_H_
-#define ASH_SHELF_SHELF_DELEGATE_H_
+#ifndef ASH_COMMON_SHELF_SHELF_DELEGATE_H_
+#define ASH_COMMON_SHELF_SHELF_DELEGATE_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/shelf/shelf_item_types.h"
 
 namespace ash {
 class Shelf;
 
-// Delegate for the Shelf.
+// Delegate shared by all shelf instances.
 class ASH_EXPORT ShelfDelegate {
  public:
-  // Shelf owns the delegate.
   virtual ~ShelfDelegate() {}
 
   // Callback used to allow delegate to perform initialization actions that
   // depend on the Shelf being in a known state.
   virtual void OnShelfCreated(Shelf* shelf) = 0;
 
   // Callback used to inform the delegate that a specific shelf no longer
   // exists.
   virtual void OnShelfDestroyed(Shelf* shelf) = 0;
 
@@ skipping 27 matching lines @@
 
   // Check if the app with |app_id_| is pinned to the shelf.
   virtual bool IsAppPinned(const std::string& app_id) = 0;
 
   // Unpins app item with |app_id|.
   virtual void UnpinAppWithID(const std::string& app_id) = 0;
 };
 
 }  // namespace ash
 
-#endif  // ASH_SHELF_SHELF_DELEGATE_H_
+#endif  // ASH_COMMON_SHELF_SHELF_DELEGATE_H_