Merge "Call clearCallingIdentity before notifyDnsResponse"

            // the caller thread of registerNetworkAgent. Thus, it's not allowed to register netd

            // event callback for certain nai. e.g. cellular. Register here to pass to

            // NetworkMonitor instead.

            // TODO: Move the Dns Event to NetworkMonitor. Use Binder.clearCallingIdentity() in

            // registerNetworkAgent to have NetworkMonitor created with system process as design

            // expectation. Also, NetdEventListenerService only allow one callback from each

            // caller type. Need to re-factor NetdEventListenerService to allow multiple

            // NetworkMonitor registrants.

            // TODO: Move the Dns Event to NetworkMonitor. NetdEventListenerService only allow one

            // callback from each caller type. Need to re-factor NetdEventListenerService to allow

            // multiple NetworkMonitor registrants.

            if (nai != null && nai.satisfies(mDefaultRequest)) {

                final long token = Binder.clearCallingIdentity();

                try {

                    nai.networkMonitor().notifyDnsResponse(returnCode);

                } catch (RemoteException e) {

                    e.rethrowFromSystemServer();

                } finally {

                    Binder.restoreCallingIdentity(token);

                }

            }

        }