Bug 952863, Part 2: Remove dead code for non-ECDHE TLS False Start, r=keeler

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extra : rebase_source : 47ee95682f769b8e10aaf55b0f4fccfef1fcdea0
Bug 952863, Part 3: Remove more dead code, r=briansmith

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extra : rebase_source : 2f1793584597aed0d559538aa1ed00c0d3afc788