Bug 1057328 - get gmp path for app-override tests, r=ted

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extra : rebase_source : 19485859be5c0660d36242e2920fa3d4ca662666
Bug 1004418 - create a mochitest to verify all JS we ship parses, r=ttaubert

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extra : rebase_source : 94af2c3b26c3fca0f3c697b56c5e7b7d6488fce6