Bug 862353 - Only enable mozContacts in B2G and mochitests. r=gwagner

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extra : rebase_source : 914bd36790ae01f83c3f84817b2021f0f7dbcf22
Bug 862353 - Only enable mozSettings in B2G and mochitests. r=gwagner

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extra : rebase_source : 2b079aa6aca6a65516670cc5adcccf422b5e0261
Bug 862353 - Remove NavigatorPropertyHelper. r=bent