Update references to the extension messaging APIs to point to the "runtime"

chrome/common/extensions/docs/examples/api/messaging/timer/page.js

Index: chrome/common/extensions/docs/examples/api/messaging/timer/page.js
diff --git a/chrome/common/extensions/docs/examples/api/messaging/timer/page.js b/chrome/common/extensions/docs/examples/api/messaging/timer/page.js
index 92f8df375fb73a4c9dcdf707ef77bc02d165fd07..bdbf9bf9568eec5395242b45fd52cadf3c7d1323 100644
--- a/chrome/common/extensions/docs/examples/api/messaging/timer/page.js
+++ b/chrome/common/extensions/docs/examples/api/messaging/timer/page.js
@@ -1,4 +1,8 @@
-chrome.extension.onConnect.addListener(function(port) {
+// Copyright (c) 2013 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.
+
+chrome.runtime.onConnect.addListener(function(port) {
   port.onMessage.addListener(function(msg) {
     port.postMessage({counter: msg.counter+1});
   });