ObserverList::HasObserver now takes a const pointer.

chromeos/dbus/fake_cras_audio_client.cc

 // 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.
 
 #include "chromeos/dbus/fake_cras_audio_client.h"
 
 namespace chromeos {
 
 FakeCrasAudioClient::FakeCrasAudioClient()
     : active_input_node_id_(0),
@@ skipping 50 matching lines @@
 }
 
 void FakeCrasAudioClient::AddObserver(Observer* observer) {
   observers_.AddObserver(observer);
 }
 
 void FakeCrasAudioClient::RemoveObserver(Observer* observer) {
   observers_.RemoveObserver(observer);
 }
 
-bool FakeCrasAudioClient::HasObserver(Observer* observer) {
+bool FakeCrasAudioClient::HasObserver(const Observer* observer) const {
   return observers_.HasObserver(observer);
 }
 
 void FakeCrasAudioClient::GetVolumeState(
     const GetVolumeStateCallback& callback) {
   callback.Run(volume_state_, true);
 }
 
 void FakeCrasAudioClient::GetNodes(const GetNodesCallback& callback,
                                    const ErrorCallback& error_callback) {
@@ skipping 90 matching lines @@
   node_list_ = audio_nodes;
 }
 
 void FakeCrasAudioClient::SetAudioNodesAndNotifyObserversForTesting(
     const AudioNodeList& new_nodes) {
   SetAudioNodesForTesting(new_nodes);
   FOR_EACH_OBSERVER(Observer, observers_, NodesChanged());
 }
 
 }  // namespace chromeos