Backout 8b8bbe7aa1cc due to wrong bug number
Bug 869836 - Part 9a: Use AssignLiteral(MOZ_UTF16(...)) instead of Assign(NS_LITERAL_STRING(...)). r=ehsan
Relading with correct bug number so DONTBUILD.

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extra : amend_source : 6e05de7729c27761564124212b7d4cbe3318e482