TBR: mojo_impl: Fix signature of DbExec.

Change-Id: I788a147fa49c1b26583b91da88bb34e118ab2885
diff --git a/x/ref/services/syncbase/server/mojo_impl.go b/x/ref/services/syncbase/server/mojo_impl.go
index e99195e..bc7d0d7 100644
--- a/x/ref/services/syncbase/server/mojo_impl.go
+++ b/x/ref/services/syncbase/server/mojo_impl.go
@@ -75,7 +75,7 @@
 	return wire.Error{}, false, nil
 }
 
-func (m *mojoImpl) DbExec(name string, stream wire.ExecStream_Request) (wire.Error, error) {
+func (m *mojoImpl) DbExec(name string, query string, stream wire.ExecStream_Request) (wire.Error, error) {
 	return wire.Error{}, nil
 }