Use token-based initialisation for the utility process MojoApplication.

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 4bf0c3d2188db464173ffa46bda35ac130fe4732..e92d3f2969399df9e3ba09fa4b2fc73f473142b4 100644
--- a/content/browser/utility_process_host_impl.h
+++ b/content/browser/utility_process_host_impl.h
@@ -77,7 +77,6 @@ class CONTENT_EXPORT UtilityProcessHostImpl
   bool OnMessageReceived(const IPC::Message& message) override;
   void OnProcessLaunchFailed() override;
   void OnProcessCrashed(int exit_code) override;
-  void OnProcessLaunched() override;
 
   // Cleans up |this| as a result of a failed Start().
   void NotifyAndDelete();