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

net/tools/quic/test_tools/packet_dropping_test_writer.h

 // 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.
 
 #ifndef NET_TOOLS_QUIC_TEST_TOOLS_PACKET_DROPPING_TEST_WRITER_H_
 #define NET_TOOLS_QUIC_TEST_TOOLS_PACKET_DROPPING_TEST_WRITER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 45 matching lines @@
 
   bool IsWriteBlocked() const override;
 
   void SetWritable() override;
 
   // Writes out any packet which should have been sent by now
   // to the contained writer and returns the time
   // for the next delayed packet to be written.
   QuicTime ReleaseOldPackets();
 
+  // Sets |delay_alarm_| to fire at |new_deadline|.
+  void SetDelayAlarm(QuicTime new_deadline);
+
   void OnCanWrite();
 
   // The percent of time a packet is simulated as being lost.
   void set_fake_packet_loss_percentage(int32_t fake_packet_loss_percentage) {
     base::AutoLock locked(config_mutex_);
     fake_packet_loss_percentage_ = fake_packet_loss_percentage;
   }
 
   // Simulate dropping the first n packets unconditionally.
   // Subsequent packets will be lost at fake_packet_loss_percentage_ if set.
@@ skipping 92 matching lines @@
   QuicBandwidth fake_bandwidth_;
   QuicByteCount buffer_size_;
 
   DISALLOW_COPY_AND_ASSIGN(PacketDroppingTestWriter);
 };
 
 }  // namespace test
 }  // namespace net
 
 #endif  // NET_TOOLS_QUIC_TEST_TOOLS_PACKET_DROPPING_TEST_WRITER_H_