Take notification API out of experimental.

chrome/renderer/resources/extensions/notifications_custom_bindings.js

Index: chrome/renderer/resources/extensions/notifications_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/notification_custom_bindings.js b/chrome/renderer/resources/extensions/notifications_custom_bindings.js
similarity index 93%
rename from chrome/renderer/resources/extensions/notification_custom_bindings.js
rename to chrome/renderer/resources/extensions/notifications_custom_bindings.js
index b88be0981d705c479fdde0bf4eb372822a7ef31b..99f02cac0b3ef583416acba52b8a0eab80ba1736 100644
--- a/chrome/renderer/resources/extensions/notification_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/notifications_custom_bindings.js
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Custom bindings for the notification API.
+// Custom bindings for the chrome.notifications API.
 
 var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
 var sendRequest = require('sendRequest').sendRequest;
@@ -118,11 +118,10 @@ function genHandle(failure_function) {
 var handleCreate = genHandle(function(callback, id) { callback(id); });
 var handleUpdate = genHandle(function(callback, id) { callback(false); });
 
-var experimentalNotificationCustomHook = function(bindingsAPI, extensionId) {
+var notificationsCustomHook = function(bindingsAPI, extensionId) {
   var apiFunctions = bindingsAPI.apiFunctions;
   apiFunctions.setHandleRequest('create', handleCreate);
   apiFunctions.setHandleRequest('update', handleCreate);
 };
 
-chromeHidden.registerCustomHook('experimental.notification',
-                                experimentalNotificationCustomHook);
+chromeHidden.registerCustomHook('notifications', notificationsCustomHook);