By Andrew McCarty On Friday afternoon, Robert Griffin III had a harsh message for the Cleveland Browns about quarterback Baker Mayfield. RGIII thinks the Browns should have traded Mayfield before the team put the final touches on Deshaun Watson’s contract. That would have saved the team a massive headache of having a disgruntled Mayfield. “The Browns needed to trade Baker Mayfield before the ink dried on Deshaun Watson’s contract,” Griffin wrote on Twitter. “Instead, they trashed Baker in the media, aided in killing his trade value and are stuck with a QB they don’t want.” Some Browns fans pus…