| Index: net/quic/quic_connection.cc | 
| diff --git a/net/quic/quic_connection.cc b/net/quic/quic_connection.cc | 
| index 407a163c1ac38e8edc53bf0b8d9838a809cd6afa..1fd4e37258ef2854d887d88a050fa1576edbfe18 100644 | 
| --- a/net/quic/quic_connection.cc | 
| +++ b/net/quic/quic_connection.cc | 
| @@ -88,7 +88,8 @@ class AckAlarm : public QuicAlarm::Delegate { | 
|  | 
| void OnAlarm() override { | 
| DCHECK(connection_->ack_frame_updated()); | 
| -    connection_->SendAck(); | 
| +    QuicConnection::ScopedPacketBundler bundler(connection_, | 
| +                                                QuicConnection::SEND_ACK); | 
| } | 
|  | 
| private: | 
|  |