Backed out 2 debugging changesets (bug 916757) to avoid uplifting, now the failures have been identified; CLOSED TREE

Backed out changeset 1713de744990 (bug 916757)
Backed out changeset 861e1c86d759 (bug 916757)

--HG--
extra : transplant_source : %A0%FC%C3%EB%89/%BD%B9%08lv%3F%C1q%AD%DC%B5%E0bE