There simply is not, warriors at the moment lack a pvp side.
Regardless of what people will come spam in this thread, cause i see it comming, there is no viable spec.
Fury : do not even consider going fury as you pretty much gain 1 intercept but on the other side once it's on cooldown you have nothing to prevent roots.
Arms : The most balanced out of the 3 i would say, your mobility is extremely low but you have a good bladestorm to avoid roots ( yes the damage is so low it's not even worth using it to hurt ) but than again once your charge is on cooldown you are ready to be kited unless you have a holy paladin / Hand of freedom / or a healer spam disppeling you ( this is worth for fury as well )
Prot : Great survability compared to the other too but extremely low damage if not when using recklessness ( once each 5 minute ), altough you have both charge and intercept.
If you are looking to arena as a warrior in 2's you rather go Holy Paladin - Arms Warrior.
For 3's : Disc / Hpala / Rshaman - Frost Mage - Protection, you spend your whole time ccing along with a bit of recklessness burst.
For battlegrounds you will not have anything to have pleasure with unless you queue with a healer.