This is the first pass at making GetIPConfigs asynchronous.

chromeos/dbus/shill_device_client.cc

Index: chromeos/dbus/shill_device_client.cc
diff --git a/chromeos/dbus/shill_device_client.cc b/chromeos/dbus/shill_device_client.cc
index 39ca916bebb16c1d2713e5300ae9ce930dadf04c..e758730358cd25394f7b4b9536bfceafd85ab549 100644
--- a/chromeos/dbus/shill_device_client.cc
+++ b/chromeos/dbus/shill_device_client.cc
@@ -399,11 +399,14 @@ class ShillDeviceClientStubImpl : public ShillDeviceClient,
     const base::DictionaryValue* device_properties = NULL;
     if (!stub_devices_.GetDictionaryWithoutPathExpansion(
             device_path.value(), &device_properties)) {
-      base::DictionaryValue empty_dictionary;
-      callback.Run(DBUS_METHOD_CALL_FAILURE, empty_dictionary);
+      scoped_ptr<base::DictionaryValue> empty_dictionary(
+          new base::DictionaryValue);
+      callback.Run(DBUS_METHOD_CALL_FAILURE, empty_dictionary.Pass());
       return;
     }
-    callback.Run(DBUS_METHOD_CALL_SUCCESS, *device_properties);
+    scoped_ptr<base::DictionaryValue> properties_copy(
+        device_properties->DeepCopy());
+    callback.Run(DBUS_METHOD_CALL_SUCCESS, properties_copy.Pass());
   }
 
   // Posts a task to run a void callback with status code |status|.