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

net/tools/quic/quic_time_wait_list_manager.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/tools/quic/quic_time_wait_list_manager.h"
 
 #include <errno.h>
 
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 16 matching lines @@
 
 // A very simple alarm that just informs the QuicTimeWaitListManager to clean
 // up old connection_ids. This alarm should be cancelled  and deleted before
 // the QuicTimeWaitListManager is deleted.
 class ConnectionIdCleanUpAlarm : public QuicAlarm::Delegate {
  public:
   explicit ConnectionIdCleanUpAlarm(
       QuicTimeWaitListManager* time_wait_list_manager)
       : time_wait_list_manager_(time_wait_list_manager) {}
 
-  QuicTime OnAlarm() override {
+  void OnAlarm() override {
     time_wait_list_manager_->CleanUpOldConnectionIds();
-    // Let the time wait manager register the alarm at appropriate time.
-    return QuicTime::Zero();
   }
 
  private:
   // Not owned.
   QuicTimeWaitListManager* time_wait_list_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ConnectionIdCleanUpAlarm);
 };
 
 // This class stores pending public reset packets to be sent to clients.
@@ skipping 284 matching lines @@
       version(version_),
       time_added(time_added_),
       connection_rejected_statelessly(connection_rejected_statelessly) {}
 
 QuicTimeWaitListManager::ConnectionIdData::ConnectionIdData(
     const ConnectionIdData& other) = default;
 
 QuicTimeWaitListManager::ConnectionIdData::~ConnectionIdData() {}
 
 }  // namespace net