Make PromiseResolver's members read-only

ui/webui/resources/js/compiled_resources2.gyp

 # Copyright 2015 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': 'action_link',
       'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
     {
@@ skipping 42 matching lines @@
       'target_name': 'load_time_data',
       'dependencies': ['<(DEPTH)/third_party/jstemplate/compiled_resources2.gyp:jstemplate'],
       'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'parse_html_subset',
       'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'promise_resolver',
+      'dependencies': ['assert'],
       'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'util',
       'dependencies': [
         '<(EXTERNS_GYP):chrome_send',
         'cr',
       ],
       'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'web_ui_listener_behavior',
       'dependencies': [
         'cr',
       ],
       'includes': ['../../../../third_party/closure_compiler/compile_js2.gypi'],
     },
   ],
 }