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

net/quic/quic_alarm.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_QUIC_QUIC_ALARM_H_
 #define NET_QUIC_QUIC_ALARM_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/base/net_export.h"
 #include "net/quic/quic_arena_scoped_ptr.h"
 #include "net/quic/quic_time.h"
 
 namespace net {
 
 // Abstract class which represents an alarm which will go off at a
 // scheduled time, and execute the |OnAlarm| method of the delegate.
 // An alarm may be cancelled, in which case it may or may not be
 // removed from the underlying scheduling system, but in either case
 // the task will not be executed.
 class NET_EXPORT_PRIVATE QuicAlarm {
  public:
   class NET_EXPORT_PRIVATE Delegate {
    public:
     virtual ~Delegate() {}
 
-    // Invoked when the alarm fires.  If the return value is not
-    // infinite, then the alarm will be rescheduled at the
-    // specified time.
-    virtual QuicTime OnAlarm() = 0;
+    // Invoked when the alarm fires.
+    virtual void OnAlarm() = 0;
   };
 
   explicit QuicAlarm(QuicArenaScopedPtr<Delegate> delegate);
   virtual ~QuicAlarm();
 
   // Sets the alarm to fire at |deadline|.  Must not be called while
   // the alarm is set.  To reschedule an alarm, call Cancel() first,
   // then Set().
   void Set(QuicTime new_deadline);
 
@@ skipping 35 matching lines @@
  private:
   QuicArenaScopedPtr<Delegate> delegate_;
   QuicTime deadline_;
 
   DISALLOW_COPY_AND_ASSIGN(QuicAlarm);
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_ALARM_H_