Reduce DBus ObjectUnknown ERROR to WARNING

dbus/object_proxy.h

 // Copyright (c) 2012 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 DBUS_OBJECT_PROXY_H_
 #define DBUS_OBJECT_PROXY_H_
 
 #include <dbus/dbus.h>
 
 #include <map>
@@ skipping 28 matching lines @@
  public:
   // Client code should use Bus::GetObjectProxy() or
   // Bus::GetObjectProxyWithOptions() instead of this constructor.
   ObjectProxy(Bus* bus,
               const std::string& service_name,
               const ObjectPath& object_path,
               int options);
 
   // Options to be OR-ed together when calling Bus::GetObjectProxyWithOptions().
   // Set the IGNORE_SERVICE_UNKNOWN_ERRORS option to silence logging of
-  // org.freedesktop.DBus.Error.ServiceUnknown errors.
+  // org.freedesktop.DBus.Error.ServiceUnknown errors and
+  // org.freedesktop.DBus.Error.ObjectUnknown errors.
   enum Options {
     DEFAULT_OPTIONS = 0,
     IGNORE_SERVICE_UNKNOWN_ERRORS = 1 << 0
   };
 
   // Special timeout constants.
   //
   // The constants correspond to DBUS_TIMEOUT_USE_DEFAULT and
   // DBUS_TIMEOUT_INFINITE. Here we use literal numbers instead of these
   // macros as these aren't defined with D-Bus earlier than 1.4.12.
@@ skipping 246 matching lines @@
 
   // Known name owner of the well-known bus name represnted by |service_name_|.
   std::string service_name_owner_;
 
   DISALLOW_COPY_AND_ASSIGN(ObjectProxy);
 };
 
 }  // namespace dbus
 
 #endif  // DBUS_OBJECT_PROXY_H_