Allow multiple object proxies to handle NameOwnerChanged

dbus/object_proxy.cc

 // 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.
 
 #include "dbus/bus.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/metrics/histogram.h"
@@ skipping 643 matching lines @@
       if (!name_owner_changed_callback_.is_null()) {
         const base::TimeTicks start_time = base::TimeTicks::Now();
         Signal* released_signal = signal.release();
         bus_->PostTaskToOriginThread(FROM_HERE,
                                      base::Bind(&ObjectProxy::RunMethod,
                                                 this,
                                                 start_time,
                                                 name_owner_changed_callback_,
                                                 released_signal));
       }
-      return DBUS_HANDLER_RESULT_HANDLED;
     }
   }
 
-  // Untrusted or uninteresting signal
+  // Always return unhandled to let other object proxies handle the same
+  // signal.
   return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 }
 
 }  // namespace dbus