Revert "review undertow Http2OpenListener"

This reverts commit 11fe2b7.

Author: neowu

core-ng/src/main/java/io/undertow/server/protocol/http2/Http2OpenListener.java

@@ -36,6 +36,7 @@
 import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 
+
 /**
  * Open listener for HTTP2 server
  *
@@ -84,6 +85,11 @@ public void handleEvent(final StreamConnection channel, PooledByteBuffer buffer)
         http2Channel.resumeReceives();
     }
 
+    @Override
+    public void handleEvent(StreamConnection channel) {
+        handleEvent(channel, null);
+    }
+
     @Override
     public ConnectorStatistics getConnectorStatistics() {
         return null;
@@ -123,9 +129,4 @@ public void setUndertowOptions(final OptionMap undertowOptions) {
     public ByteBufferPool getBufferPool() {
         return bufferPool;
     }
-
-    @Override
-    public void handleEvent(StreamConnection channel) {
-        handleEvent(channel, null);
-    }
 }