Enable sandbox in local discovery utility process.

chrome/browser/local_discovery/service_discovery_host_client.cc

Index: chrome/browser/local_discovery/service_discovery_host_client.cc
diff --git a/chrome/browser/local_discovery/service_discovery_host_client.cc b/chrome/browser/local_discovery/service_discovery_host_client.cc
index 2d6db4b99ce9775fe056e032e242000329c836c2..42b5a22f43839224a956d81519eed64845df924a 100644
--- a/chrome/browser/local_discovery/service_discovery_host_client.cc
+++ b/chrome/browser/local_discovery/service_discovery_host_client.cc
@@ -163,8 +163,7 @@ void ServiceDiscoveryHostClient::StartOnIOThread() {
       this, base::MessageLoopProxy::current().get())->AsWeakPtr();
   if (utility_host_) {
     utility_host_->EnableZygote();
-    // TODO(vitalybuka): enable sandbox. http://crbug.com/245391
-    utility_host_->DisableSandbox();
+    utility_host_->EnableMDns();
     utility_host_->StartBatchMode();
   }
 }