Bug 354493 - revert Add nsINetworkZonePolicy to protect resources loaded from private IPs r=backout a=sylvestre

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extra : rebase_source : 47f4a29e5546eacdab673389fd3f09204e4800a0
extra : amend_source : 5cf773963015d2f3794b345ff3b9e6e9373adb43