Clear the QUIC ping alarm when a connection in closed.

net/quic/quic_connection.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/quic/quic_connection.h"
 
 #include <string.h>
 #include <sys/types.h>
 #include <algorithm>
 #include <iterator>
@@ skipping 1774 matching lines @@
     return;
   }
   connected_ = false;
   if (debug_visitor_.get() != NULL) {
     debug_visitor_->OnConnectionClosed(error, from_peer);
   }
   visitor_->OnConnectionClosed(error, from_peer);
   // Cancel the alarms so they don't trigger any action now that the
   // connection is closed.
   ack_alarm_->Cancel();
+  ping_alarm_->Cancel();
   resume_writes_alarm_->Cancel();
   retransmission_alarm_->Cancel();
   send_alarm_->Cancel();
   timeout_alarm_->Cancel();
 }
 
 void QuicConnection::SendGoAway(QuicErrorCode error,
                                 QuicStreamId last_good_stream_id,
                                 const string& reason) {
   DVLOG(1) << ENDPOINT << "Going away with error "
@@ skipping 179 matching lines @@
   // If we changed the generator's batch state, restore original batch state.
   if (!already_in_batch_mode_) {
     DVLOG(1) << "Leaving Batch Mode.";
     connection_->packet_generator_.FinishBatchOperations();
   }
   DCHECK_EQ(already_in_batch_mode_,
             connection_->packet_generator_.InBatchMode());
 }
 
 }  // namespace net