[Extensions Bindings] Support chrome.extension.lastError

chrome/test/data/extensions/api_test/native_bindings/extension/background.js

 // Copyright 2016 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.
 
 if (!chrome || !chrome.test)
   throw new Error('chrome.test is undefined');
 
 var portNumber;
 
 // This is a good end-to-end test for two reasons. The first is obvious - it
@@ skipping 106 matching lines @@
         chrome.test.assertEq('new title', results[0]);
         chrome.tabs.get(tab.id, tab => {
           chrome.test.assertEq('new title', tab.title);
           chrome.test.succeed();
         });
       });
     });
   },
   function testLastError() {
     chrome.runtime.setUninstallURL('chrome://newtab', function() {
-      chrome.test.assertLastError('Invalid URL: "chrome://newtab".');
+      var expectedError = 'Invalid URL: "chrome://newtab".';
+      chrome.test.assertLastError(expectedError);
+      // Explicitly also test the old extension.lastError property.
+      chrome.test.assertTrue(!!chrome.extension.lastError);
+      chrome.test.assertEq(expectedError, chrome.extension.lastError.message);
       chrome.test.succeed();
     });
   },
   function testStorage() {
     // Check API existence; StorageArea functions.
     chrome.test.assertTrue(!!chrome.storage);
     chrome.test.assertTrue(!!chrome.storage.local, 'no local');
     chrome.test.assertTrue(!!chrome.storage.local.set, 'no set');
     chrome.test.assertTrue(!!chrome.storage.local.get, 'no get');
     // Check some properties.
@@ skipping 183 matching lines @@
     });
   },
 ];
 
 chrome.test.getConfig(config => {
   chrome.test.assertTrue(!!config, 'config does not exist');
   chrome.test.assertTrue(!!config.testServer, 'testServer does not exist');
   portNumber = config.testServer.port;
   chrome.test.runTests(tests);
 });