Allow dbus clients to silence logging when a service is unavailable.

net/base/network_change_notifier_linux.cc

 // Copyright (c) 2011 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.
 //
 // This implementation of NetworkChangeNotifier's offline state detection
 // depends on D-Bus and NetworkManager, and is known to work on at least
 // GNOME version 2.30.  If D-Bus or NetworkManager are unavailable, this
 // implementation will always behave as if it is online.
 
 #include "net/base/network_change_notifier_linux.h"
@@ skipping 118 matching lines @@
   helper_thread_id_ = base::PlatformThread::CurrentId();
 
   if (!system_bus_) {
     dbus::Bus::Options options;
     options.bus_type = dbus::Bus::SYSTEM;
     options.connection_type = dbus::Bus::PRIVATE;
     system_bus_ = new dbus::Bus(options);
   }
 
   dbus::ObjectProxy* proxy =
-      system_bus_->GetObjectProxy(kNetworkManagerServiceName,
-                                  kNetworkManagerPath);
+      system_bus_->GetObjectProxyIgnoreUnknownService(

[satorux1, 2012/02/10 08:12:52]

Please add some comment why you do this. Having a reference to the bug URL would
be nice. crbug.com/...

[adamk, 2012/02/10 17:57:16]

Split out into another patch. Sorry, the lack of comment here comes from
spending all my time in WebKit land.

+          kNetworkManagerServiceName, kNetworkManagerPath);
 
   // Get the initial state asynchronously.
   dbus::MethodCall method_call(DBUS_INTERFACE_PROPERTIES, "Get");
   dbus::MessageWriter builder(&method_call);
   builder.AppendString(kNetworkManagerInterface);
   builder.AppendString("State");
   proxy->CallMethod(
       &method_call, dbus::ObjectProxy::TIMEOUT_USE_DEFAULT,
       base::Bind(&NetworkManagerApi::OnInitialResponse,
                  ptr_factory_.GetWeakPtr()));
@@ skipping 306 matching lines @@
   // Stopping from here allows us to sanity- check that the notifier
   // thread shut down properly.
   notifier_thread_->Stop();
 }
 
 bool NetworkChangeNotifierLinux::IsCurrentlyOffline() const {
   return notifier_thread_->IsCurrentlyOffline();
 }
 
 }  // namespace net