dbus: Stop accessing ObjectProxy::name_owner_changed_callback_ on the D-Bus thread

chromeos/dbus/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/cras_audio_client.h"
 
 #include "base/bind.h"
 #include "base/format_macros.h"
 #include "base/strings/stringprintf.h"
 #include "chromeos/dbus/cras_audio_client_stub_impl.h"
@@ skipping 179 matching lines @@
 
  private:
   // Called when the cras signal is initially connected.
   void SignalConnected(const std::string& interface_name,
                        const std::string& signal_name,
                        bool success) {
     LOG_IF(ERROR, !success)
         << "Failed to connect to cras signal:" << signal_name;
   }
 
-  void NameOwnerChangedReceived(dbus::Signal* signal) {
+  void NameOwnerChangedReceived(const std::string& old_owner,
+                                const std::string& new_owner) {
     FOR_EACH_OBSERVER(Observer, observers_, AudioClientRestarted());
   }
 
   // Called when a OutputMuteChanged signal is received.
   void OutputMuteChangedReceived(dbus::Signal* signal) {
     // Chrome should always call SetOutputUserMute api to set the output
     // mute state and monitor user_mute state from OutputMuteChanged signal.
     dbus::MessageReader reader(signal);
     bool system_mute, user_mute;
     if (!reader.PopBool(&system_mute) || !reader.PopBool(&user_mute)) {
@@ skipping 191 matching lines @@
 // static
 CrasAudioClient* CrasAudioClient::Create(DBusClientImplementationType type) {
   if (type == REAL_DBUS_CLIENT_IMPLEMENTATION) {
     return new CrasAudioClientImpl();
   }
   DCHECK_EQ(STUB_DBUS_CLIENT_IMPLEMENTATION, type);
   return new CrasAudioClientStubImpl();
 }
 
 }  // namespace chromeos