Fix hangs in Mandoline page cycler on Linux with --enable-multiprocess.

mandoline/services/core_services/core_services_application_delegate.h

Index: mandoline/services/core_services/core_services_application_delegate.h
diff --git a/mandoline/services/core_services/core_services_application_delegate.h b/mandoline/services/core_services/core_services_application_delegate.h
index f0129ae9d55703552314e0ac703a838f681cac6d..168f068d77b9804812c716c40708d383118393d1 100644
--- a/mandoline/services/core_services/core_services_application_delegate.h
+++ b/mandoline/services/core_services/core_services_application_delegate.h
@@ -45,7 +45,8 @@ class CoreServicesApplicationDelegate
   // Overridden from mojo::ContentHandler:
   void StartApplication(
       mojo::InterfaceRequest<mojo::Application> request,
-      mojo::URLResponsePtr response) override;
+      mojo::URLResponsePtr response,
+      const mojo::Callback<void()>& destruct_callback) override;
 
   // Bindings for all of our connections.
   mojo::WeakBindingSet<ContentHandler> handler_bindings_;