Referee Chad Patton did not know that The Undertaker would be losing to Brock Lesnar at WrestleMania XXX. He was told Taker was but the rule every referee is told is that if the guys don't kick out, you the count. Right after the match ended, Lesnar whispered in Taker's ear, "Thank you."
Apparently the decision to end The Streak was finalized on March 31st. Only a few people knew the outcome before WrestleMania Sunday. The group of people that knew were most likely Vince McMahon, Taker, Lesnar, Paul Heyman, Triple H and McMahon. None of the agents were aware. The actual for did not have a finish listed but this didn't raise any red flags because that's not unusual for WrestleMania and it wasn't the only match that didn't have a finish listed.
Whether or not The Undertaker is done, Vince was going on the assumption that this was his last match and he could either or lose. McMahon chose the idea that it's better to lose on out. One close to the situation said Vince talked Taker into losing. Another person, who would also be in the know, described it as Vince making the call and Taker agreeing, and that he wasn’t talked into doing something he didn’t want to do. Losing was not Taker's original decision but he was in on it and never protested the decision. Perhaps, like he thought in 2010, if he was going to lose, maybe he thought Lesnar was the guy to lose to.
There were many people within WWE very unhappy about The Streak ending but couldn't say so publicly.
CREDIT / SOURCE - Wrestling Observer Newsletter