Remove unused return value from QuicAlarm::Delegate::OnAlarm. No behavior change, not protected.

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"
 #include "net/quic/quic_flags.h"
 
 namespace net {
@@ skipping 35 matching lines @@
 bool QuicAlarm::IsSet() const {
   return deadline_.IsInitialized();
 }
 
 void QuicAlarm::Fire() {
   if (!IsSet()) {
     return;
   }
 
   deadline_ = QuicTime::Zero();
-  QuicTime new_deadline = delegate_->OnAlarm();
-  // delegate_->OnAlarm() might call Set(), in which case deadline_
-  // will already contain the new value, so don't overwrite it.  Also,
-  // OnAlarm() might delete |this| so check |deadline| before
-  // |deadline_|.
-  if (new_deadline.IsInitialized() && !IsSet()) {
-    Set(new_deadline);
-  }
+  delegate_->OnAlarm();
 }
 
 }  // namespace net