Bug 783451 - Remove outdated FIXME comment. r=nrc,bent DONTBUILD

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extra : rebase_source : 374ea9d0259081dc532c1c64f168fbf95f6fe9eb
Bug 783451 - Add ipdl testcases. r=bent DONTBUILD

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extra : rebase_source : 7943a9f7d594a5790782c3f37b5bda46ae1a30cc