Clean up code by removing network traffic code in network library....

chrome/browser/chromeos/network_state_notifier.h

 // Copyright (c) 2010 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 CHROME_BROWSER_CHROMEOS_NETWORK_STATE_NOTIFIER_H_
 #define CHROME_BROWSER_CHROMEOS_NETWORK_STATE_NOTIFIER_H_
 #pragma once
 
 #include "chrome/browser/chromeos/cros/network_library.h"
 
@@ skipping 43 matching lines @@
   // when network is connected.
   static base::TimeDelta GetOfflineDuration();
 
   // Returns true if the network is connected.
   static bool is_connected() {
     return Get()->state_ == NetworkStateDetails::CONNECTED;
   }
 
   // NetworkLibrary::Observer implementation.
   virtual void NetworkChanged(NetworkLibrary* cros);
-  virtual void NetworkTraffic(NetworkLibrary* cros, int traffic_type) {}
 
  private:
   friend struct DefaultSingletonTraits<NetworkStateNotifier>;
 
   // Retrieve the current state from libcros.
   static NetworkStateDetails::State RetrieveState();
 
   NetworkStateNotifier();
   virtual ~NetworkStateNotifier() {}
 
   // Update the current state and sends notification to observers.
   // This should be invoked in UI thread.
   void UpdateNetworkState(NetworkStateDetails::State new_state);
 
   // A factory to post a task in UI thread.
   ScopedRunnableMethodFactory<NetworkStateNotifier> task_factory_;
 
   // The current network state.
   NetworkStateDetails::State state_;
 
   // The start time of offline.
   base::Time offline_start_time_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkStateNotifier);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_NETWORK_STATE_NOTIFIER_H_