Enable sandbox in local discovery utility process.

chrome/browser/local_discovery/service_discovery_host_client.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/local_discovery/service_discovery_host_client.h"
 
 #include "chrome/common/local_discovery/local_discovery_messages.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/utility_process_host.h"
 
@@ skipping 140 matching lines @@
       BrowserThread::IO,
       FROM_HERE,
       base::Bind(&ServiceDiscoveryHostClient::StartOnIOThread, this));
 }
 
 void ServiceDiscoveryHostClient::Shutdown() {
   DCHECK(CalledOnValidThread());
   BrowserThread::PostTask(
       BrowserThread::IO,
       FROM_HERE,
       base::Bind(&ServiceDiscoveryHostClient::ShutdownOnIOThread, this));

[Noam Samuel, 2013/07/18 16:29:07]

Is there a potential race condition here if shutdown finishes before the
ServiceDiscoveryHostClient is de-refed on the UI thread, causing the utility
process host to be destroyed on the UI thread rather than on the IO thread?

[Vitaly Buka (NO REVIEWS), 2013/07/18 18:16:16]

No.

 }
 
 void ServiceDiscoveryHostClient::StartOnIOThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   utility_host_ = UtilityProcessHost::Create(
       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();
   }
 }
 
 void ServiceDiscoveryHostClient::ShutdownOnIOThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   if (utility_host_)
     utility_host_->EndBatchMode();
 }
 
@@ skipping 55 matching lines @@
     uint64 id,
     ServiceResolver::RequestStatus status,
     const ServiceDescription& description) {
   DCHECK(CalledOnValidThread());
   ResolverCallbacks::iterator it = service_resolver_callbacks_.find(id);
   if (it != service_resolver_callbacks_.end() && !it->second.is_null())
     it->second.Run(status, description);
 }
 
 }  // namespace local_discovery