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

Source/core/dom/EventTarget.cpp

Index: Source/core/dom/EventTarget.cpp
diff --git a/Source/core/dom/EventTarget.cpp b/Source/core/dom/EventTarget.cpp
index db4032152b38c8c78206f0b42599858ce018126c..8c4f5b1ab83de90f309d44222798dd80bd8398dd 100644
--- a/Source/core/dom/EventTarget.cpp
+++ b/Source/core/dom/EventTarget.cpp
@@ -68,6 +68,11 @@ DOMWindow* EventTarget::toDOMWindow()
     return 0;
 }
 
+MessagePort* EventTarget::toMessagePort()
+{
+    return 0;
+}
+
 inline DOMWindow* EventTarget::executingWindow()
 {
     if (ScriptExecutionContext* context = scriptExecutionContext())