Use mojo Shelf interfaces for both mash and classic ash.

chrome/browser/ui/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/chromecast_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build/split_static_library.gni")
 import("//chrome/common/features.gni")
@@ skipping 1298 matching lines @@
       "ash/launcher/chrome_launcher_app_menu_item_v2app.cc",
       "ash/launcher/chrome_launcher_app_menu_item_v2app.h",
       "ash/launcher/chrome_launcher_controller.cc",
       "ash/launcher/chrome_launcher_controller.h",
       "ash/launcher/chrome_launcher_controller_impl.cc",
       "ash/launcher/chrome_launcher_controller_impl.h",
       "ash/launcher/chrome_launcher_controller_mus.cc",
       "ash/launcher/chrome_launcher_controller_mus.h",
       "ash/launcher/chrome_launcher_controller_util.cc",
       "ash/launcher/chrome_launcher_controller_util.h",
-      "ash/launcher/chrome_mash_shelf_controller.cc",
-      "ash/launcher/chrome_mash_shelf_controller.h",
       "ash/launcher/desktop_shell_launcher_context_menu.cc",
       "ash/launcher/desktop_shell_launcher_context_menu.h",
       "ash/launcher/extension_app_window_launcher_controller.cc",
       "ash/launcher/extension_app_window_launcher_controller.h",
       "ash/launcher/extension_app_window_launcher_item_controller.cc",
       "ash/launcher/extension_app_window_launcher_item_controller.h",
       "ash/launcher/extension_launcher_context_menu.cc",
       "ash/launcher/extension_launcher_context_menu.h",
       "ash/launcher/launcher_app_updater.cc",
       "ash/launcher/launcher_app_updater.h",
@@ skipping 2092 matching lines @@
       "test/test_confirm_bubble_model.cc",
       "test/test_confirm_bubble_model.h",
     ]
     deps += [ "//chrome/test:test_support_ui" ]
   }
 
   if (enable_extensions) {
     deps += [ "//extensions/browser" ]
   }
 }