Bug 945851: Remove pref for showing dialog box when NSS initialization fails, r=briansmith

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extra : rebase_source : 1142d1775b8846e8bd46109affc62df262e598d4
Bug 945855: Remove the security.first_network_revocation_method pref, r=briansmith

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extra : rebase_source : e416ba1e78f95234d403c078ad81b5fddcce947a
extra : amend_source : 7adbe291df748b5a6d1f1122573e862bdc5f5f11