mash: Move shelf_navigator.* to //ash/common/shelf

ash/shelf/shelf_navigator.h

Index: ash/shelf/shelf_navigator.h
diff --git a/ash/shelf/shelf_navigator.h b/ash/shelf/shelf_navigator.h
deleted file mode 100644
index ead455e929caf77c89da782f8c8a26b5b90e4426..0000000000000000000000000000000000000000
--- a/ash/shelf/shelf_navigator.h
+++ /dev/null
@@ -1,23 +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_NAVIGATOR_H_
-#define ASH_SHELF_SHELF_NAVIGATOR_H_
-
-#include "ash/ash_export.h"
-#include "ash/common/shelf/shelf_constants.h"
-
-namespace ash {
-
-class ShelfModel;
-
-// Scans the current shelf item and returns the index of the shelf item which
-// should be activated next for the specified |direction|. Returns -1 if fails
-// to find such item.
-ASH_EXPORT int GetNextActivatedItemIndex(const ShelfModel& model,
-                                         CycleDirection direction);
-
-}  // namespace ash
-
-#endif  // ASH_SHELF_SHELF_NAVIGATOR_H_