Bug 860899 - Fixup metro mochitests r=jimm

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extra : rebase_source : c512b5afb0a457d411e4706571a7f1482a4a8f88
Bug 863069 - Part 4: Reorder lists to be alphabetical; r=ted

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extra : rebase_source : 87ed9d862bc32824d518438b0be74b47a77c198a
Bug 863069 - Part 5: Require sorted lists in moz.build files; r=ted

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extra : rebase_source : c5b91990944e3cc19d3759b894e41d88e42032cd