Change FilterChain::Append() to a template method.

mojo/public/cpp/bindings/sync_dispatcher.h

Index: mojo/public/cpp/bindings/sync_dispatcher.h
diff --git a/mojo/public/cpp/bindings/sync_dispatcher.h b/mojo/public/cpp/bindings/sync_dispatcher.h
index 695f4399cd5eadf5caf35625478c5cb5a51fba1f..9f825bf8a6ae83be748514539d8d2527fc360c59 100644
--- a/mojo/public/cpp/bindings/sync_dispatcher.h
+++ b/mojo/public/cpp/bindings/sync_dispatcher.h
@@ -26,9 +26,9 @@ template<typename Interface> class SyncDispatcher {
       : message_pipe_(message_pipe.Pass()) {
     stub_.set_sink(sink);
 
-    filters_.Append(new internal::MessageHeaderValidator)
-            .Append(new typename Interface::RequestValidator_);
-    filters_.set_sink(&stub_);
+    filters_.Append<internal::MessageHeaderValidator>();
+    filters_.Append<typename Interface::RequestValidator_>();
+    filters_.SetSink(&stub_);
   }
 
   bool WaitAndDispatchOneMessage() {