Bug 958916: Update to NSS 3.15.5 beta 3 (NSS_3_15_5_BETA3), r=me

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extra : rebase_source : 569c37a2b5ff3fb6e65a15f82b4c0fb1f2ae603d
Bug 964493, Part 2: Test, r=briansmith

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extra : rebase_source : 4bc219aaece6f16458ce7755acf552bf956e01a0
Bug 967175: Remove EV entries for ValiCert (Go Daddy) roots removed in bug 936304, r=kwilson

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extra : rebase_source : b87998d88f38057d37b7518cf1f4fb485c505b31
Bug 967299: Fix async/sync issue in test_ev_certs.js, r=keeler

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extra : rebase_source : bb7e0a593205ff95de35cf4eecb65ed9dc91a630