Hack to restrict runtime API to dev channel rather than experimental.

chrome/common/extensions/docs/js/api_page_generator.js

 // Copyright (c) 2012 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.
 
 /**
  * @fileoverview This file is the controller for generating extension
  * doc pages.
  *
  * It expects to have available via XHR (relative path):
  *   1) API_TEMPLATE which is the main template for the api pages.
@@ skipping 29 matching lines @@
   '../api/experimental_font_settings.json',
   '../api/experimental_identity.json',
   '../api/experimental_infobars.json',
   '../api/experimental_input_ui.json',
   '../api/experimental_input_virtual_keyboard.json',
   '../api/experimental_keybinding.json',
   '../api/experimental_media_galleries.json',
   '../api/experimental_offscreen_tabs.json',
   '../api/experimental_processes.json',
   '../api/experimental_rlz.json',
-  '../api/experimental_runtime.json',
   '../api/experimental_speech_input.json',
   '../api/extension.json',
   '../api/file_browser_handler.json',
   '../api/file_browser_private.json',
   '../api/history.json',
   '../api/i18n.json',
   '../api/idle.json',
   '../api/input_ime.json',
   '../api/input_method_private.json',
   '../api/managed_mode_private.json',
   '../api/management.json',
   '../api/media_player_private.json',
   '../api/metrics_private.json',
   '../api/omnibox.json',
   '../api/page_action.json',
   '../api/page_actions.json',
   '../api/page_capture.json',
   '../api/permissions.json',
   '../api/privacy.json',
   '../api/proxy.json',
+  '../api/runtime.json',
   '../api/storage.json',
   '../api/system_private.json',
   '../api/tabs.json',
   '../api/test.json',
   '../api/top_sites.json',
   '../api/tts.json',
   '../api/tts_engine.json',
   '../api/types.json',
   '../api/web_navigation.json',
   '../api/web_request.json',
@@ skipping 677 matching lines @@
   }
   if (a.name > b.name) {
     return 1;
   }
   return 0;
 }
 
 function disableDocs(obj) {
   return !!obj.nodoc;
 }