ash: Add GetItemIndexForType() function to ShelfModel.

ash/ash.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
     'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/chrome',
   },
   'includes': [
@@ skipping 197 matching lines @@
         'shelf/shelf_bezel_event_filter.cc',
         'shelf/shelf_bezel_event_filter.h',
         'shelf/shelf_button_host.h',
         'shelf/shelf_icon_observer.h',
         'shelf/shelf_layout_manager.cc',
         'shelf/shelf_layout_manager.h',
         'shelf/shelf_layout_manager_observer.h',
         'shelf/shelf_model.cc',
         'shelf/shelf_model.h',
         'shelf/shelf_model_observer.h',
-        'shelf/shelf_model_util.cc',
-        'shelf/shelf_model_util.h',
         'shelf/shelf_navigator.cc',
         'shelf/shelf_navigator.h',
         'shelf/shelf_tooltip_manager.cc',
         'shelf/shelf_tooltip_manager.h',
         'shelf/shelf_types.h',
         'shelf/shelf_view.cc',
         'shelf/shelf_view.h',
         'shelf/shelf_widget.cc',
         'shelf/shelf_widget.h',
         'shell.cc',
@@ skipping 747 matching lines @@
             },
           },
           'dependencies': [
             '../sandbox/sandbox.gyp:sandbox',
           ],
         }],
       ],
     },
   ],
 }