Convert UtilityProcess to use MojoChild/ShellConnection for the shell handshake.

content/utility/utility_thread_impl.cc

Index: content/utility/utility_thread_impl.cc
diff --git a/content/utility/utility_thread_impl.cc b/content/utility/utility_thread_impl.cc
index 8425e664eb580abf37dd23489e9be26aa8ef3eb5..14894ed071be5bfc8d572ad93c5f71f00e941e1e 100644
--- a/content/utility/utility_thread_impl.cc
+++ b/content/utility/utility_thread_impl.cc
@@ -40,7 +40,8 @@ void ConvertVector(const SRC& src, DEST* dest) {
 }  // namespace
 
 UtilityThreadImpl::UtilityThreadImpl()
-    : ChildThreadImpl(ChildThreadImpl::Options::Builder().Build()) {
+    : ChildThreadImpl(ChildThreadImpl::Options::Builder().
+          UseMojoShellConnection(true).Build()) {
   Init();
 }
 
@@ -48,6 +49,7 @@ UtilityThreadImpl::UtilityThreadImpl(const InProcessChildThreadParams& params)
     : ChildThreadImpl(ChildThreadImpl::Options::Builder()
                           .InBrowserProcess(params)
                           .UseMojoChannel(true)
+                          .UseMojoShellConnection(true)
                           .Build()) {
   Init();
 }