Start changing WebDOMMessageEvent for using target execution context.

Source/web/tests/WebFrameTest.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 792 matching lines @@
 TEST_P(ParameterizedWebFrameTest, DispatchMessageEventWithOriginCheck)
 {
     registerMockedHttpURLLoad("postmessage_test.html");
 
     // Pass true to enable JavaScript.
     FrameTestHelpers::WebViewHelper webViewHelper(this);
     webViewHelper.initializeAndLoad(m_baseURL + "postmessage_test.html", true);
 
     // Send a message with the correct origin.
     WebSecurityOrigin correctOrigin(WebSecurityOrigin::create(toKURL(m_baseURL)));
-    WebDOMEvent event = webViewHelper.webView()->mainFrame()->document().createEvent("MessageEvent");
+    WebDocument document = webViewHelper.webView()->mainFrame()->document();
+    WebDOMEvent event = document.createEvent("MessageEvent");
     WebDOMMessageEvent message = event.to<WebDOMMessageEvent>();
     WebSerializedScriptValue data(WebSerializedScriptValue::fromString("foo"));
-    message.initMessageEvent("message", false, false, data, "http://origin.com", 0, "");
+    message.initMessageEvent("message", false, false, data, "http://origin.com", 0, document, "");
     webViewHelper.webView()->mainFrame()->dispatchMessageEventWithOriginCheck(correctOrigin, message);
 
     // Send another message with incorrect origin.
     WebSecurityOrigin incorrectOrigin(WebSecurityOrigin::create(toKURL(m_chromeURL)));
     webViewHelper.webView()->mainFrame()->dispatchMessageEventWithOriginCheck(incorrectOrigin, message);
 
     // Required to see any updates in contentAsText.
     webViewHelper.webView()->layout();
 
     // Verify that only the first addition is in the body of the page.
@@ skipping 7213 matching lines @@
 
 TEST_F(WebFrameTest, MaxFramesDetach)
 {
     registerMockedHttpURLLoad("max-frames-detach.html");
     FrameTestHelpers::WebViewHelper webViewHelper;
     WebViewImpl* webViewImpl = webViewHelper.initializeAndLoad(m_baseURL + "max-frames-detach.html", true);
     webViewImpl->mainFrameImpl()->collectGarbage();
 }
 
 } // namespace blink