ash: Add GetItemIndexForType() function to ShelfModel.

ash/shelf/shelf_model_util.h

Index: ash/shelf/shelf_model_util.h
diff --git a/ash/shelf/shelf_model_util.h b/ash/shelf/shelf_model_util.h
deleted file mode 100644
index 4aa94d9da2919b9d0692ed4a98ffc6a80501d3e1..0000000000000000000000000000000000000000
--- a/ash/shelf/shelf_model_util.h
+++ /dev/null
@@ -1,25 +0,0 @@
-// 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_MODEL_UTIL_H_
-#define ASH_SHELF_SHELF_MODEL_UTIL_H_
-
-#include "ash/ash_export.h"
-#include "ash/launcher/launcher_types.h"
-
-namespace ash {
-
-class ShelfModel;
-
-// Return the index of the |type| from a given |shelf_model|.
-// Note:
-//  * If there are many items for |type| in the |shelf_model|, an index of
-//    first item will be returned.
-//  * If there is no item for |type|, -1 will be returned.
-ASH_EXPORT int GetShelfItemIndexForType(LauncherItemType type,
-                                        const ShelfModel& shelf_model);
-
-}  // namespace ash
-
-#endif  // ASH_SHELF_SHELF_MODEL_UTIL_H_