Improve <adview> implementation and add tests.

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

Index: chrome/test/data/extensions/platform_apps/ad_view/ad_network_loaded/chrometest.js
diff --git a/chrome/test/data/extensions/platform_apps/ad_view/ad_network_loaded/chrometest.js b/chrome/test/data/extensions/platform_apps/ad_view/ad_network_loaded/chrometest.js
deleted file mode 100644
index f4f4f596ca8ce6c35ee7a6b047221e267cfce6e7..0000000000000000000000000000000000000000
--- a/chrome/test/data/extensions/platform_apps/ad_view/ad_network_loaded/chrometest.js
+++ /dev/null
@@ -1,25 +0,0 @@
-// Copyright (c) 2013 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.
-
-chrome.test.getConfig(function(config) {
-  var guestURL = 'http://localhost:' + config.testServer.port +
-      '/files/extensions/platform_apps/ad_view/ad_network/testsdk.html';
-
-  var adview = document.getElementsByTagName("adview")[0];
-
-  adview.addEventListener("loadcommit", function() {
-    adview.contentWindow.postMessage({
-      message: "onloadcommit",
-      data: "data"
-    }, "*");
-  })
-
-  adview.setAttribute("src", guestURL);
-
-  window.addEventListener("message", function(event) {
-    if (event.data.message == "onloadcommit-ack") {
-      chrome.test.sendMessage("ad-network-loaded");
-    }
-  })
-});