Revert back tentative for AsyncHttpClient#904

Need more investigations

Author: slandelle

src/main/java/com/ning/http/client/providers/netty/handler/Processor.java

@@ -125,7 +125,7 @@ public void channelClosed(ChannelHandlerContext ctx, ChannelStateEvent e) throws
                     && requestSender.applyIoExceptionFiltersAndReplayRequest(future, CHANNEL_CLOSED_EXCEPTION, channel))
                 return;
 
-            protocol.onError(future, null);
+            protocol.onClose(future);
             requestSender.handleUnexpectedClosedChannel(channel, future);
         }
     }

src/main/java/com/ning/http/client/providers/netty/handler/WebSocketProtocol.java

@@ -178,7 +178,7 @@ public void setContent(ChannelBuffer content) {
     public void onError(NettyResponseFuture<?> future, Throwable e) {
         logger.warn("onError {}", e);
 
-        Throwable throwable = e == null ? new UnexpectedWebSocketException() : e.getCause() == null ? e : e.getCause();
+        Throwable throwable = e.getCause() == null ? e : e.getCause();
 
         try {
             WebSocketUpgradeHandler h = (WebSocketUpgradeHandler) future.getAsyncHandler();
@@ -208,7 +208,4 @@ public void onClose(NettyResponseFuture<?> future) {
             logger.error("onError", t);
         }
     }
-
-    private final static class UnexpectedWebSocketException extends Exception {
-    }
 }