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

net/tools/quic/quic_dispatcher.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_dispatcher.h"
 
 #include <utility>
 
 #include "base/debug/stack_trace.h"
 #include "base/logging.h"
@@ skipping 12 matching lines @@
 using base::StringPiece;
 
 namespace {
 
 // An alarm that informs the QuicDispatcher to delete old sessions.
 class DeleteSessionsAlarm : public QuicAlarm::Delegate {
  public:
   explicit DeleteSessionsAlarm(QuicDispatcher* dispatcher)
       : dispatcher_(dispatcher) {}
 
-  QuicTime OnAlarm() override {
-    dispatcher_->DeleteSessions();
-    // Let the dispatcher register the alarm at appropriate time.
-    return QuicTime::Zero();
-  }
+  void OnAlarm() override { dispatcher_->DeleteSessions(); }
 
  private:
   // Not owned.
   QuicDispatcher* dispatcher_;
 
   DISALLOW_COPY_AND_ASSIGN(DeleteSessionsAlarm);
 };
 
 }  // namespace
 
@@ skipping 434 matching lines @@
 
 QuicPacketWriter* QuicDispatcher::CreatePerConnectionWriter() {
   return new QuicPerConnectionPacketWriter(writer_.get());
 }
 
 void QuicDispatcher::SetLastError(QuicErrorCode error) {
   last_error_ = error;
 }
 
 }  // namespace net