Take notification API out of experimental.

chrome/browser/notifications/message_center_settings_controller.cc

Index: chrome/browser/notifications/message_center_settings_controller.cc
diff --git a/chrome/browser/notifications/message_center_settings_controller.cc b/chrome/browser/notifications/message_center_settings_controller.cc
index 261e0765593cde5ef4c6ec8b941f1cd0b6b7e217..96ca7c0504ca556f5b19d1c72d92adc98995dbf8 100644
--- a/chrome/browser/notifications/message_center_settings_controller.cc
+++ b/chrome/browser/notifications/message_center_settings_controller.cc
@@ -55,10 +55,8 @@ void MessageCenterSettingsController::GetNotifierList(
   for (ExtensionSet::const_iterator iter = extension_set->begin();
        iter != extension_set->end(); ++iter) {
     const extensions::Extension* extension = *iter;
-    // Currently, our notification API is provided for experimental apps.
-    // TODO(mukai, miket): determine the actual rule and fix here.
-    if (!extension->is_app() || !extension->HasAPIPermission(
-            extensions::APIPermission::kExperimental)) {
+    if (!extension->HasAPIPermission(
+      extensions::APIPermission::kNotification)) {
       continue;
     }