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

chrome/common/extensions/docs/examples/extensions/benchmark/background.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.
 
 // Round a number to the 1's place.
 function formatNumber(str) {
   str += '';
   if (str == '0') {
     return 'N/A ';
   }
@@ skipping 394 matching lines @@
         chrome.benchmarking.closeConnections();
       }
       setTimeout(me_.runPage, 100);
     }
 
     // Update the UI
     me_.displayResults();
   };
 }
 
-chrome.extension.onConnect.addListener(function(port) {
+chrome.runtime.onConnect.addListener(function(port) {
   port.onMessage.addListener(function(data) {
     if (data.message == "load") {
       var benchmark = findBenchmark(data.url);
       if (benchmark == undefined && benchmarkStillRunning()) {
         alert("Error: Loaded url(" + data.url + ") is not the same as what " +
               "you set in url box. This could happen if the request is " +
               "redirected. Please use the redirected url for testing.");
         // Stop the test here.
         benchmarks = [];
       }
@@ skipping 58 matching lines @@
   if ( (urlSubStr1 == httpStr) || (urlSubStr2 == httpsStr) ) {
     return true;
   }
   return false;
 }
 
 // Run at startup
 chrome.windows.getCurrent(function(currentWindow) {
   window.windowId = currentWindow.id;
 });