MD Settings: Convert remaining classes to ES6 syntax.

chrome/browser/resources/settings/compiled_resources2.gyp

 # Copyright 2016 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.
 {
   'targets': [
     {
       'target_name': 'direction_delegate',
       'dependencies': [
-        '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:assert',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:load_time_data',
       ],
       'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'extension_control_browser_proxy',
       'dependencies': [
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:assert',
         '<(DEPTH)/ui/webui/resources/js/compiled_resources2.gyp:cr',
@@ skipping 81 matching lines @@
         'settings_menu/compiled_resources2.gyp:*',
         'settings_page/compiled_resources2.gyp:*',
         'settings_ui/compiled_resources2.gyp:*',
         'site_settings/compiled_resources2.gyp:*',
         'site_settings_page/compiled_resources2.gyp:*',
         'system_page/compiled_resources2.gyp:*',
       ],
     },
   ],
 }