Update to match change to ChatDisplay interface.

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@847 ed5b42cb-e716-0410-a449-f6a68f950b19

src/as/com/threerings/flex/ChatDisplayBox.as

@@ -59,8 +59,7 @@ public class ChatDisplayBox extends TextArea
     }
 
     // documentation inherited from interface ChatDisplay
-    public function displayMessage (
-        msg :ChatMessage, alreadyDisplayed :Boolean) :Boolean
+    public function displayMessage (msg :ChatMessage) :void
     {
         if (!_scrollBot) {
             _scrollBot = (verticalScrollPosition == maxVerticalScrollPosition);
@@ -72,7 +71,6 @@ public class ChatDisplayBox extends TextArea
                 (msg as UserMessage).speaker + "&gt;</font> ";
         }
         this.htmlText += msg.message;
-        return true;
     }
 
     // handle us being added or removed from the stage