Various webview cleanup.

extensions/test/data/web_view/apitest/main.js

 // Copyright 2014 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.
 
 var embedder = {};
 
 // TODO(lfg) Move these functions to a common js.
 embedder.setUp_ = function(config) {
   if (!config || !config.testServer) {
     return;
@@ skipping 653 matching lines @@
         embedder.test.assertEq('red', results[0]);
         embedder.test.succeed();
       });
   });
   webview.setAttribute('src', 'data:text/html,trigger navigation');
   document.body.appendChild(webview);
 }
 
 function testExecuteScriptFail() {
   var webview = document.createElement('webview');
-  try {
+  document.body.appendChild(webview);
+  setTimeout(function() {
     webview.executeScript(
-        {code: 'document.body.style.backgroundColor = "red";'},
-        function(results) { embedder.test.fail(); });
-  }
-  catch (e) {
-    embedder.test.succeed();
-  }
+        {code:'document.body.style.backgroundColor = "red";'},
+        function(results) {
+          embedder.test.fail();
+        });
+    setTimeout(function() {
+      embedder.test.succeed();
+    }, 0);
+  }, 0);
 }
 
 // This test verifies that the call of executeScript will fail and return null
 // if the webview has been navigated to another source.
 function testExecuteScriptIsAbortedWhenWebViewSourceIsChanged() {
   var webview = document.createElement('webview');
   var initial = true;
   var navigationOccur = false;
   var newSrc = 'data:text/html,trigger navigation';
   webview.addEventListener('loadstart', function() {
@@ skipping 1034 matching lines @@
   'testWebRequestAPIExistence': testWebRequestAPIExistence,
   'testWebRequestAPIGoogleProperty': testWebRequestAPIGoogleProperty
 };
 
 onload = function() {
   chrome.test.getConfig(function(config) {
     embedder.setUp_(config);
     chrome.test.sendMessage('LAUNCHED');
   });
 };