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

chrome/test/data/extensions/api_test/speech_input/recognition_error/test.js

 // Copyright (c) 2011 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.
 
 // Extension Speech Input api test.
 // browser_tests --gtest_filter="ExtensionSpeechInputApiTest.*"
 
 chrome.test.runTests([
   function testSpeechInputRecognitionError() {
     // Results should never be provided in this test case.
     chrome.experimental.speechInput.onResult.addListener(function(event) {
       chrome.test.fail();
     });
 
     // Ensure the recognition error happens.
     chrome.experimental.speechInput.onError.addListener(function(error) {
       chrome.test.assertEq(error.code, "networkError");
 
       // No recording should be happening after an error.
       chrome.experimental.speechInput.isRecording(function(recording) {
         chrome.test.assertNoLastError();
         chrome.test.assertFalse(recording);
 
         // Stopping should fail since we're in the idle state again.
         chrome.experimental.speechInput.stop(function() {
-          chrome.test.assertEq(chrome.extension.lastError.message,
+          chrome.test.assertEq(chrome.runtime.lastError.message,
               "invalidOperation");
           chrome.test.succeed();
         });
       });
     });
 
     // Start recording.
     chrome.experimental.speechInput.start({}, function() {
       chrome.test.assertNoLastError();
     });
   }
 ]);