dbus: Suppress NameHasNoOwner errors when connecting to signals

dbus/object_proxy.cc

Index: dbus/object_proxy.cc
diff --git a/dbus/object_proxy.cc b/dbus/object_proxy.cc
index 95aab8956d43ff22178874ad6a60bbcf87efc097..ea76fd72f091f9393d647e7da5f6ebfe85468a1f 100644
--- a/dbus/object_proxy.cc
+++ b/dbus/object_proxy.cc
@@ -612,8 +612,12 @@ bool ObjectProxy::AddMatchRuleWithoutCallback(
 
 void ObjectProxy::UpdateNameOwnerAndBlock() {
   bus_->AssertOnDBusThread();
+  // Errors should be suppressed here, as the service may not be yet running
+  // when connecting to signals of the service, which is just fine.
+  // The ObjectProxy will be notified when the service is launched via
+  // NameOwnerChanged signal. See also comments in ConnectToSignalInternal().
   service_name_owner_ =
-      bus_->GetServiceOwnerAndBlock(service_name_, Bus::REPORT_ERRORS);
+      bus_->GetServiceOwnerAndBlock(service_name_, Bus::SUPPRESS_ERRORS);
 }
 
 DBusHandlerResult ObjectProxy::HandleNameOwnerChanged(