Refactor net::NetLog to provide implementation of observer pattern, not just the interface.

remoting/host/vlog_net_log.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 REMOTING_HOST_VLOG_NET_LOG_H_
 #define REMOTING_HOST_VLOG_NET_LOG_H_
 
 #include "base/memory/scoped_handle.h"
+#include "base/memory/scoped_ptr.h"
 #include "net/base/net_log.h"
 
 namespace remoting {
 
 // Redirectes all networking events (i.e. events logged through net::NetLog) to
 // VLOG(4). Note that an explicit reference to a net::NetLog object has to be
 // passed to networking classes to receive the events. There is no global
 // network events logger exists.
 class VlogNetLog : public net::NetLog {
  public:
   VlogNetLog();
   virtual ~VlogNetLog();
 
-  // NetLog overrides:
-  virtual void OnAddEntry(const NetLog::Entry& entry) OVERRIDE;
-  virtual uint32 NextID() OVERRIDE;
-  virtual LogLevel GetLogLevel() const OVERRIDE;
-  virtual void AddThreadSafeObserver(ThreadSafeObserver* observer,
-                                     LogLevel log_level) OVERRIDE;
-  virtual void SetObserverLogLevel(ThreadSafeObserver* observer,
-                                   LogLevel log_level) OVERRIDE;
-  virtual void RemoveThreadSafeObserver(ThreadSafeObserver* observer) OVERRIDE;
-
  private:
-  uint32 id_;
+  class Observer;
+  scoped_ptr<Observer> observer_;
 
   DISALLOW_COPY_AND_ASSIGN(VlogNetLog);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_VLOG_NET_LOG_H_