Backed out changesets 715fce49a07b and abbc05319449 (bug 851916) for B2G mochitest-2 orange.

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rename : dom/imptests/webapps/DOMCore/tests/submissions/Ms2ger/ChildNode-remove.js => dom/imptests/webapps/DOMCore/tests/submissions/Ms2ger/test_ChildNode-remove.js