Improve <adview> implementation and add tests.

chrome/test/data/extensions/platform_apps/ad_view/loadabort_event/chrometest.js

Index: chrome/test/data/extensions/platform_apps/ad_view/loadabort_event/chrometest.js
diff --git a/chrome/test/data/extensions/platform_apps/ad_view/load_event/chrometest.js b/chrome/test/data/extensions/platform_apps/ad_view/loadabort_event/chrometest.js
similarity index 50%
copy from chrome/test/data/extensions/platform_apps/ad_view/load_event/chrometest.js
copy to chrome/test/data/extensions/platform_apps/ad_view/loadabort_event/chrometest.js
index 0886f555365b8803186a065541f9686db003f350..054a293d46bbc4d0d6cfcb7b35b9385fabc70110 100644
--- a/chrome/test/data/extensions/platform_apps/ad_view/load_event/chrometest.js
+++ b/chrome/test/data/extensions/platform_apps/ad_view/loadabort_event/chrometest.js
@@ -3,12 +3,15 @@
 // found in the LICENSE file.
 
 chrome.test.getConfig(function(config) {
-  var guestURL = 'http://localhost:' + config.testServer.port +
-      '/files/extensions/platform_apps/ad_view/ad_network/testsdk.html';
+  var guestURL = 'http://255.255.255.255/fake_file.html';
   var adview = document.getElementsByTagName("adview")[0];
 
-  adview.addEventListener("loadcommit", function() {
-    chrome.test.sendMessage('guest-loaded');
+  adview.addEventListener("loadabort", function(event) {
+    var url = event.url;
+    var isTopLevel = event.isTopLevel;
+    chrome.test.assertEq(guestURL, url);
+    chrome.test.assertEq(true, isTopLevel);
+    chrome.test.sendMessage('loadabort-received');
   })
 
   adview.setAttribute("src", guestURL);