Enable sandbox in local discovery utility process.

content/browser/utility_process_host_impl.h

Index: content/browser/utility_process_host_impl.h
diff --git a/content/browser/utility_process_host_impl.h b/content/browser/utility_process_host_impl.h
index 779bc02d444223acd443a72fa6663c6333cf4797..45d2b3f77e86ea3fcb9aa5bbbf1da50215d0a9a6 100644
--- a/content/browser/utility_process_host_impl.h
+++ b/content/browser/utility_process_host_impl.h
@@ -37,6 +37,7 @@ class CONTENT_EXPORT UtilityProcessHostImpl
   virtual bool StartBatchMode() OVERRIDE;
   virtual void EndBatchMode() OVERRIDE;
   virtual void SetExposedDir(const base::FilePath& dir) OVERRIDE;
+  virtual void EnableMDns() OVERRIDE;
   virtual void DisableSandbox() OVERRIDE;
   virtual void EnableZygote() OVERRIDE;
   virtual const ChildProcessData& GetData() OVERRIDE;
@@ -64,6 +65,9 @@ class CONTENT_EXPORT UtilityProcessHostImpl
 
   base::FilePath exposed_dir_;
 
+  // Whether utility process needs perform presandbox initialization for MDns.
+  bool is_mdns_enabled_;
+
   // Whether to pass switches::kNoSandbox to the child.
   bool no_sandbox_;