Stop restricting the sender object path for incoming signals.

dbus/test_service.h

Index: dbus/test_service.h
diff --git a/dbus/test_service.h b/dbus/test_service.h
index f4a8a84c5286ec6cfca96a7f33ca00b4345bb05d..3ea40db8b66decf4149fb729c596bfe135b17224 100644
--- a/dbus/test_service.h
+++ b/dbus/test_service.h
@@ -62,10 +62,17 @@ class TestService : public base::Thread {
   // Sends "Test" signal with the given message from the exported object.
   void SendTestSignal(const std::string& message);
 
+  // Sends "Test" signal with the given message from the root object ("/").
+  // This function emulates dbus-send's behavior.
+  void SendTestSignalFromRoot(const std::string& message);
+
  private:
   // Helper function for SendTestSignal().
   void SendTestSignalInternal(const std::string& message);
 
+  // Helper function for SendTestSignalFromRoot.
+  void SendTestSignalFromRootInternal(const std::string& message);
+
   // Helper function for ShutdownAndBlock().
   void ShutdownAndBlockInternal();