Eliminate a timed wait from ExportedObject::HandleMessage().

dbus/bus.h

Index: dbus/bus.h
diff --git a/dbus/bus.h b/dbus/bus.h
index 3d64a088f176237fd01fd4544de2d3291e3b1ad9..d8d077d27060e68d8029d62b48f96d847bda3f8a 100644
--- a/dbus/bus.h
+++ b/dbus/bus.h
@@ -383,6 +383,9 @@ class Bus : public base::RefCountedThreadSafe<Bus> {
   // AssertOnOriginThread().
   virtual void AssertOnDBusThread();
 
+  // Returns true if the bus is connected to D-Bus.
+  bool is_connected() { return connection_ != NULL; }
+
  protected:
   // This is protected, so we can define sub classes.
   virtual ~Bus();