Set MessageEvent.source to the newly created port for shared workers' connect events

Source/web/FrameLoaderClientImpl.cpp

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple 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.
@@ skipping 721 matching lines @@
     return m_webFrame->client()->cookieJar(m_webFrame);
 }
 
 bool FrameLoaderClientImpl::willCheckAndDispatchMessageEvent(
     SecurityOrigin* target, MessageEvent* event) const
 {
     if (!m_webFrame->client())
         return false;
 
     WebFrame* source = 0;
-    if (event && event->source() && event->source()->document())
-        source = WebFrameImpl::fromFrame(event->source()->document()->frame());
+    if (event && event->source() && event->source()->toDOMWindow() && event->source()->toDOMWindow()->document())
+        source = WebFrameImpl::fromFrame(event->source()->toDOMWindow()->document()->frame());
     return m_webFrame->client()->willCheckAndDispatchMessageEvent(
         source, m_webFrame, WebSecurityOrigin(target), WebDOMMessageEvent(event));
 }
 
 void FrameLoaderClientImpl::didChangeName(const String& name)
 {
     if (!m_webFrame->client())
         return;
     m_webFrame->client()->didChangeName(m_webFrame, name);
 }
@@ skipping 28 matching lines @@
         m_webFrame->client()->didLoseWebGLContext(m_webFrame, arbRobustnessContextLostReason);
 }
 
 void FrameLoaderClientImpl::dispatchWillInsertBody()
 {
     if (m_webFrame->client())
         m_webFrame->client()->willInsertBody(m_webFrame);
 }
 
 } // namespace WebKit