Bug 1074076 - Backout changeset dc419f74a94f - Feature has been backed out from Firefox 35

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branch : mozilla-aurora
Bug 1074076 - Backout changeset da7bb338173c - Feature has been backed out from Firefox 35

--HG--
branch : mozilla-aurora
Bug 1084333. Part 1 - Add getElement and getElements to BaseWindow and change the assert. r=aeftimie, r=amatei, r=hskupin

--HG--
branch : mozilla-aurora
extra : transplant_source : A%9D%EDE%F0%89%90%EC%ADp-%23%E2oC%B1jy%60%D0