QuicAlarms are now allocated out of an arena in QuicConnection

net/quic/quic_alarm.cc

 // Copyright 2013 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_alarm.h"
 
 #include "base/logging.h"
 
 namespace net {
 
-QuicAlarm::QuicAlarm(Delegate* delegate)
-    : delegate_(delegate), deadline_(QuicTime::Zero()) {}
+QuicAlarm::QuicAlarm(QuicArenaScopedPtr<Delegate> delegate)
+    : delegate_(std::move(delegate)), deadline_(QuicTime::Zero()) {}
 
 QuicAlarm::~QuicAlarm() {}
 
 void QuicAlarm::Set(QuicTime deadline) {
   DCHECK(!IsSet());
   DCHECK(deadline.IsInitialized());
   deadline_ = deadline;
   SetImpl();
 }
 
@@ skipping 27 matching lines @@
   deadline_ = QuicTime::Zero();
   QuicTime deadline = delegate_->OnAlarm();
   // delegate_->OnAlarm() might call Set(), in which case  deadline_ will
   // already contain the new value, so don't overwrite it.
   if (!deadline_.IsInitialized() && deadline.IsInitialized()) {
     Set(deadline);
   }
 }
 
 }  // namespace net