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

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 c5d265186a3de98d4ab8511ce24499f5709bcffe..88deabb1af3e03fb0d118a9855ce7b7ba7161a3f 100644
--- a/content/browser/utility_process_host_impl.h
+++ b/content/browser/utility_process_host_impl.h
@@ -26,7 +26,7 @@ class Thread;
 namespace content {
 class BrowserChildProcessHostImpl;
 class InProcessChildThreadParams;
-class MojoApplicationHost;
+class MojoChildConnection;
 
 typedef base::Thread* (*UtilityMainThreadFactoryFunction)(
     const InProcessChildThreadParams&);
@@ -121,7 +121,7 @@ class CONTENT_EXPORT UtilityProcessHostImpl
   // Browser-side Mojo endpoint which sets up a Mojo channel with the child
   // process and contains the browser's shell::InterfaceRegistry.
   const std::string child_token_;
-  std::unique_ptr<MojoApplicationHost> mojo_application_host_;
+  std::unique_ptr<MojoChildConnection> mojo_child_connection_;
 
   // Used to vend weak pointers, and should always be declared last.
   base::WeakPtrFactory<UtilityProcessHostImpl> weak_ptr_factory_;