Chido Obi-Martin on Saturday finally confirmed his move from Arsenal to Manchester United. The 16-year-old took to his social media to post images of him signing a contract. He also posted a picture of him wearing a Red Devils shirt from when he was much younger to confirm his long-term affinity with his new club. Obi-Martin opted to leave Arsenal in the summer after scoring 28 goals in the U-18 Premier League. Although Gunners boss, Mikel Arteta, fought hard to keep the striker, he ultimately decided to join United. Obi-Martin said: “Very happy to sign with this amazing club. Time to focus an…