Closure compiler: Add app_remoting_webapp to bot. Fix some errors.

remoting/webapp/files.gni

 # 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.
 
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 #   MMmmdM9  ,M'   Yb 8)   MM ,AP    MM    MM    MM    MM ,M'   Yb
 #   MM  YM.  8M""""""  ,pm9MM 8MI    MM    MM    MM    MM 8M""""""
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@@ skipping 630 matching lines @@
     "app_remoting/html/template_feedback_consent.html"
 
 # These JS files are specific to the feedback consent page and are not part
 # of the main JS files.
 ar_feedback_consent_html_js_files = [ "app_remoting/js/feedback_consent.js" ]
 
 # All the JavaScript files required by feedback_consent.html.
 ar_feedback_consent_html_all_js_files = [
   "app_remoting/js/feedback_consent.js",
   "base/js/base.js",
+  "base/js/chromoting_event.js",
   "base/js/error.js",
   "base/js/identity.js",
   "base/js/oauth2_api.js",
   "base/js/oauth2_api_impl.js",
+  "base/js/platform.js",
   "base/js/plugin_settings.js",
   "base/js/l10n.js",
   "base/js/xhr.js",
 ]
 
 # The JavaScript files to be injected into the clould print dialog.
 ar_cloud_print_dialog_js_files =
     [ "app_remoting/js/cloud_print_dialog/cloud_print_dialog_injected.js" ]
 
 #
@@ skipping 41 matching lines @@
       ar_main_template,
       ar_feedback_consent_template,
       ar_loading_window_template,
       remoting_webapp_template_message_window,
       remoting_webapp_template_wcs_sandbox,
     ] + ar_main_template_files + ar_all_js_files
 
 webapp_js_files = remoting_webapp_unittest_html_all_js_files +
                   remoting_webapp_wcs_sandbox_html_js_files +
                   remoting_webapp_background_html_js_files