Add the override annotation to all necessary methods in .../quic/.

net/tools/quic/quic_epoll_clock.h

 // 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.
 
 #ifndef NET_TOOLS_QUIC_QUIC_EPOLL_CLOCK_H_
 #define NET_TOOLS_QUIC_QUIC_EPOLL_CLOCK_H_
 
 #include "base/compiler_specific.h"
 #include "net/quic/quic_clock.h"
 #include "net/quic/quic_time.h"
 
 namespace net {
 
 class EpollServer;
 
 namespace tools {
 
 // Clock to efficiently retrieve an approximately accurate time from an
 // EpollServer.
 class QuicEpollClock : public QuicClock {
  public:
   explicit QuicEpollClock(EpollServer* epoll_server);
-  virtual ~QuicEpollClock();
+  virtual ~QuicEpollClock() OVERRIDE;
 
   // Returns the approximate current time as a QuicTime object.
   virtual QuicTime ApproximateNow() const OVERRIDE;
 
   // Returns the current time as a QuicTime object.
   // Note: this use significant resources please use only if needed.
   virtual QuicTime Now() const OVERRIDE;
 
  protected:
   EpollServer* epoll_server_;
 };
 
 }  // namespace tools
 }  // namespace net
 
 #endif  // NET_TOOLS_QUIC_QUIC_EPOLL_CLOCK_H_