Don't allow updating tabs to javascript URLs without host

chrome/renderer/resources/extension_apitest.js

 // extension_apitest.js
 // mini-framework for ExtensionApiTest browser tests
 
 var chrome = chrome || {};
 (function() {
   chrome.test = chrome.test || {};
 
   chrome.test.tests = chrome.test.tests || [];
 
   var completed = false;
@@ skipping 133 matching lines @@
       } else {
         msg += "\n(no stack available)";
       }
       chrome.test.fail(msg);
     }
   };
 
   // Wrapper for generating test functions, that takes care of calling
   // assertNoLastError() and (optionally) succeed() for you.
   chrome.test.callback = function(func, expectedError) {
-    chrome.test.assertEq(typeof(func), 'function');
+    if (func) {
+      chrome.test.assertEq(typeof(func), 'function');
+    }
+
     callbackAdded();
+
     return function() {
       if (expectedError == null) {
         chrome.test.assertNoLastError();
       } else {
         chrome.test.assertEq(typeof(expectedError), 'string');
         chrome.test.assertEq(expectedError, chrome.extension.lastError.message);
       }
-      safeFunctionApply(func, arguments);
+      
+      if (func) {
+        safeFunctionApply(func, arguments);
+      }
+
       callbackCompleted();
     };
   };
   
   chrome.test.listenOnce = function(event, func) {
     callbackAdded();
     var listener = function() {
       event.removeListener(listener);
       safeFunctionApply(func, arguments);      
       callbackCompleted();
     };
     event.addListener(listener);
   };
   
   chrome.test.callbackPass = function(func) {
     return chrome.test.callback(func);
   };
 
-  chrome.test.callbackFail = function(func, expectedError) {
-    return chrome.test.callback(func, expectedError);
+  chrome.test.callbackFail = function(expectedError) {
+    return chrome.test.callback(null, expectedError);
   };
 
   // TODO(erikkay) This is deprecated and should be removed.
   chrome.test.testCallback = function(succeedWhenDone, func) {
     return chrome.test.callback(func);
   };
   
   chrome.test.runTests = function(tests) {
     chrome.test.tests = tests;
     chrome.test.runNextTest();
   };
 
 })();