Bug 854611 - Fix typo; r=bustage DONTBUILD (NPOTB) on a CLOSED TREE

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extra : rebase_source : 2724b2d1ade71d2f0639625caae50aa2ab626509
Backed out changesets 57fc6c256d1f and a6bb570b7f41 (bug 896087) checktest failures on a CLOSED TREE.