Add a test for mime handler view iframes and make them work on Windows.

chrome/test/data/extensions/api_test/mime_handler_view/test_postmessage.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 tests = [
-  function testPostMessage() {
-    var messages = ['hey', 100, 25.0];
-    var messages_sent = 0;
-    var messages_received = 0;
+var messages = ['hey', 100, 25.0];
+var messagesSent = 0;
+var messagesReceived = 0;
 
-    window.addEventListener('message', function(event) {
-      if (event.data == messages[messages_received])
-        messages_received++;
-      else
-        chrome.test.fail();
+window.addEventListener('message', function(event) {
+  if (event.data == messages[messagesReceived]) {
+    messagesReceived++;
+    if (messagesReceived == messages.length)
+      plugin.postMessage('succeed');

[raymes, 2015/01/28 01:02:36]

Maybe we should comment on this as well to make it clear what 'succeed' and
'fail' messages are for.

[Sam McNally, 2015/01/28 01:54:43]

Done.

+  } else {
+    plugin.postMessage('fail');
+  }
+}, false);
 
-      if (messages_received == messages.length)
-        chrome.test.succeed();
-    }, false);
-
-    var plugin = document.getElementById('plugin');
-    function postNextMessage() {
-      plugin.postMessage(messages[messages_sent]);
-      messages_sent++;
-      if (messages_sent < messages.length)
-        setTimeout(postNextMessage, 0);
-    }
-    postNextMessage();
-  },
-];
-
-chrome.test.runTests(tests);
+var plugin = document.getElementById('plugin');
+function postNextMessage() {
+  plugin.postMessage(messages[messagesSent]);
+  messagesSent++;
+  if (messagesSent < messages.length)
+    setTimeout(postNextMessage, 0);
+}
+postNextMessage();