Remove the deprecated messageevent API

Source/web/WebDOMMessageEvent.cpp

Index: Source/web/WebDOMMessageEvent.cpp
diff --git a/Source/web/WebDOMMessageEvent.cpp b/Source/web/WebDOMMessageEvent.cpp
index 3e172dc5af2a526033273f70d87a73216d2ccab3..7c35d4eb29559143e7ee304b7e0168370f1d0b5d 100644
--- a/Source/web/WebDOMMessageEvent.cpp
+++ b/Source/web/WebDOMMessageEvent.cpp
@@ -63,16 +63,6 @@ void WebDOMMessageEvent::initMessageEvent(const WebString& type, bool canBubble,
     unwrap<MessageEvent>()->initMessageEvent(type, canBubble, cancelable, messageData, origin, lastEventId, window, ports);
 }
 
-void WebDOMMessageEvent::initMessageEvent(const WebString& type, bool canBubble, bool cancelable, const WebSerializedScriptValue& messageData, const WebString& origin, const WebFrame* sourceFrame, const WebString& lastEventId, const WebMessagePortChannelArray& webChannels)
-{
-    WebDocument document;
-    if (sourceFrame && sourceFrame->isWebLocalFrame()) {
-        DOMWindow* window = toCoreFrame(sourceFrame)->domWindow();
-        document = toLocalDOMWindow(window)->document();
-    }
-    initMessageEvent(type, canBubble, cancelable, messageData, origin, sourceFrame, document, lastEventId, webChannels);
-}
-
 WebSerializedScriptValue WebDOMMessageEvent::data() const
 {
     return WebSerializedScriptValue(constUnwrap<MessageEvent>()->dataAsSerializedScriptValue());