mash: Move ShelfModel* to ash/public/cpp.

ash/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//ui/base/ui_features.gni")
 
 # Historical note: Ash shipped on Windows for a couple years to support
@@ skipping 288 matching lines @@
     "shelf/shelf_button_pressed_metric_tracker.cc",
     "shelf/shelf_button_pressed_metric_tracker.h",
     "shelf/shelf_constants.h",
     "shelf/shelf_controller.cc",
     "shelf/shelf_controller.h",
     "shelf/shelf_layout_manager.cc",
     "shelf/shelf_layout_manager.h",
     "shelf/shelf_layout_manager_observer.h",
     "shelf/shelf_locking_manager.cc",
     "shelf/shelf_locking_manager.h",
-    "shelf/shelf_model.cc",
-    "shelf/shelf_model.h",
-    "shelf/shelf_model_observer.h",
     "shelf/shelf_observer.h",
     "shelf/shelf_tooltip_manager.cc",
     "shelf/shelf_tooltip_manager.h",
     "shelf/shelf_view.cc",
     "shelf/shelf_view.h",
     "shelf/shelf_widget.cc",
     "shelf/shelf_widget.h",
     "shelf/shelf_window_targeter.cc",
     "shelf/shelf_window_targeter.h",
     "shelf/shelf_window_watcher.cc",
@@ skipping 862 matching lines @@
     "rotator/screen_rotation_animator_unittest.cc",
     "screen_util_unittest.cc",
     "session/session_controller_unittest.cc",
     "shelf/app_list_button_unittest.cc",
     "shelf/shelf_application_menu_model_unittest.cc",
     "shelf/shelf_background_animator_unittest.cc",
     "shelf/shelf_button_pressed_metric_tracker_unittest.cc",
     "shelf/shelf_controller_unittest.cc",
     "shelf/shelf_layout_manager_unittest.cc",
     "shelf/shelf_locking_manager_unittest.cc",
-    "shelf/shelf_model_unittest.cc",
     "shelf/shelf_tooltip_manager_unittest.cc",
     "shelf/shelf_unittest.cc",
     "shelf/shelf_view_unittest.cc",
     "shelf/shelf_widget_unittest.cc",
     "shelf/shelf_window_watcher_unittest.cc",
     "shell_unittest.cc",
     "sticky_keys/sticky_keys_overlay_unittest.cc",
     "sticky_keys/sticky_keys_unittest.cc",
     "system/audio/tray_audio_unittest.cc",
     "system/bluetooth/tray_bluetooth_helper_unittest.cc",
@@ skipping 320 matching lines @@
     "//content/public/app:both",
     "//device/bluetooth",
   ]
 
   data_deps = [
     "//ash/strings:ash_test_strings",
     "//ash/resources:ash_test_resources_with_content_100_percent",
     "//ash/resources:ash_test_resources_200_percent",
   ]
 }