Reduce chrome cras dbus call logs during device rebooting.

chromeos/dbus/cras_audio_client_stub_impl.h

 // Copyright (c) 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 CHROMEOS_DBUS_CRAS_AUDIO_CLIENT_STUB_IMPL_H_
 #define CHROMEOS_DBUS_CRAS_AUDIO_CLIENT_STUB_IMPL_H_
 
 #include "chromeos/dbus/cras_audio_client.h"
 
 namespace chromeos {
 
 class CrasAudioHandlerTest;
 
 // The CrasAudioClient implementation used on Linux desktop.
 class CrasAudioClientStubImpl : public CrasAudioClient {
  public:
   CrasAudioClientStubImpl();
   virtual ~CrasAudioClientStubImpl();
 
   // CrasAudioClient overrides
   virtual void Init(dbus::Bus* bus) OVERRIDE;
   virtual void AddObserver(Observer* observer) OVERRIDE;
   virtual void RemoveObserver(Observer* observer) OVERRIDE;
   virtual bool HasObserver(Observer* observer) OVERRIDE;
   virtual void GetVolumeState(const GetVolumeStateCallback& callback) OVERRIDE;
-  virtual void GetNodes(const GetNodesCallback& callback) OVERRIDE;
+  virtual void GetNodes(const GetNodesCallback& callback,
+                        const ErrorCallback& error_callback) OVERRIDE;
   virtual void SetOutputNodeVolume(uint64 node_id, int32 volume) OVERRIDE;
   virtual void SetOutputUserMute(bool mute_on) OVERRIDE;
   virtual void SetInputNodeGain(uint64 node_id, int32 gain) OVERRIDE;
   virtual void SetInputMute(bool mute_on) OVERRIDE;
   virtual void SetActiveOutputNode(uint64 node_id) OVERRIDE;
   virtual void SetActiveInputNode(uint64 node_id) OVERRIDE;
 
  protected:
   // Helper functions for testing
   virtual void SetAudioDevices(const AudioNodeList& audio_nodes);
   virtual void ChangeAudioNodes(const AudioNodeList& new_nodes);
 
  private:
   friend class CrasAudioHandlerTest;
 
   VolumeState volume_state_;
   AudioNodeList node_list_;
   uint64 active_input_node_id_;
   uint64 active_output_node_id_;
   ObserverList<Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(CrasAudioClientStubImpl);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_CRAS_AUDIO_CLIENT_STUB_IMPL_H_