Backed out changeset d45ebc647b51 (missing r= line)

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extra : rebase_source : 8152fc0672e27c423494cb302eae8edd089e086f
Bug 967434 - Remove JS_HAS_DESTRUCTURING ifdefs  r=jorendorff

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extra : rebase_source : 961f0b07a7d3ae0f2598a23eaf12269186b05294