[Eraser] First pass at removing the notification center panel.

ui/message_center/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")
 
 component("message_center") {
   deps = [
@@ skipping 25 matching lines @@
   if (enable_notifications && !is_android) {
     sources = [
       "cocoa/notification_controller.h",
       "cocoa/notification_controller.mm",
       "cocoa/opaque_views.h",
       "cocoa/opaque_views.mm",
       "cocoa/popup_collection.h",
       "cocoa/popup_collection.mm",
       "cocoa/popup_controller.h",
       "cocoa/popup_controller.mm",
-      "cocoa/settings_controller.h",
-      "cocoa/settings_controller.mm",
-      "cocoa/settings_entry_view.h",
-      "cocoa/settings_entry_view.mm",
-      "cocoa/status_item_view.h",
-      "cocoa/status_item_view.mm",
-      "cocoa/tray_controller.h",
-      "cocoa/tray_controller.mm",
-      "cocoa/tray_view_controller.h",
-      "cocoa/tray_view_controller.mm",
       "message_center.cc",
       "message_center.h",
       "message_center_export.h",
       "message_center_impl.cc",
       "message_center_impl.h",
       "message_center_observer.h",
       "message_center_style.cc",
       "message_center_style.h",
       "message_center_switches.cc",
       "message_center_switches.h",
@@ skipping 139 matching lines @@
     "//ui/resources",
     "//ui/resources:ui_test_pak",
     "//url",
   ]
 
   if (enable_notifications && !is_android) {
     sources += [
       "cocoa/notification_controller_unittest.mm",
       "cocoa/popup_collection_unittest.mm",
       "cocoa/popup_controller_unittest.mm",
-      "cocoa/settings_controller_unittest.mm",
-      "cocoa/status_item_view_unittest.mm",
-      "cocoa/tray_controller_unittest.mm",
-      "cocoa/tray_view_controller_unittest.mm",
       "message_center_impl_unittest.cc",
       "message_center_tray_unittest.cc",
       "notification_delegate_unittest.cc",
       "notification_list_unittest.cc",
     ]
 
     if (is_mac) {
       deps += [ "//ui/gfx:test_support" ]
     }
 
     if (toolkit_views && !is_mac) {
       sources += [
         "views/bounded_label_unittest.cc",
         "views/message_center_view_unittest.cc",
         "views/message_popup_collection_unittest.cc",
         "views/notification_view_unittest.cc",
         "views/notifier_settings_view_unittest.cc",
       ]
       deps += [
         # Compositor is needed by message_center_view_unittest.cc and for the
         # fonts used by bounded_label_unittest.cc.
         "//ui/compositor",
         "//ui/views",
         "//ui/views:test_support",
       ]
     }
   }  # enable_notifications && !is_android
 }