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

chrome/test/data/extensions/api_test/speech_input/recognition/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 testSpeechInputRecognition() {
     var did_sound_start = false;
@@ skipping 22 matching lines @@
       chrome.test.assertEq(event.hypotheses[0].utterance, "this is a test");
       chrome.test.assertEq(event.hypotheses[0].confidence, 0.99);
 
       // Ensure no recording is happening after delivering results.
       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();
         });
       });
     });
 
     // Ensure that no errors happened during the recognition.
     chrome.experimental.speechInput.onError.addListener(function(event) {
       chrome.test.fail();
     });
 
     // Recording is not active, start it.
     chrome.experimental.speechInput.isRecording(function(recording) {
       chrome.test.assertNoLastError();
       chrome.test.assertFalse(recording);
       chrome.experimental.speechInput.start({}, function() {
         chrome.test.assertNoLastError();
       });
     });
   }
 ]);