Enable sandbox in local discovery utility process.

chrome/app/chrome_main_delegate.cc

Index: chrome/app/chrome_main_delegate.cc
diff --git a/chrome/app/chrome_main_delegate.cc b/chrome/app/chrome_main_delegate.cc
index ab692b65e83bd130d0f75044ac9a3c046af190ff..4077d3c9703c50de65f64a02ffb1c5fe113e1934 100644
--- a/chrome/app/chrome_main_delegate.cc
+++ b/chrome/app/chrome_main_delegate.cc
@@ -636,6 +636,11 @@ void ChromeMainDelegate::PreSandboxStartup() {
     // only do this when ResourcesBundle has been initialized).
     SetMacProcessName(command_line);
 #endif  // defined(OS_MACOSX)
+
+#if !defined(CHROME_MULTIPLE_DLL_BROWSER)
+    if (process_type == switches::kUtilityProcess)
+      chrome::ChromeContentUtilityClient::PreSandboxStartup();
+#endif
   }
 
 #if defined(OS_POSIX) && !defined(OS_MACOSX)