It’s a new record for Harry Styles. The pop superstar’s smash hit “As It Was” recorded its 15th week atop Billboard’s Hot 100 singles chart — making him the first British artist to have a No. 1 hit in the U.S. for that long. Elton John had two songs — “Candle in the Wind” and ”Something About the Way You Look Tonight” — go 14 weeks at No. 1 in 1997, while fellow British artist Mark Ronson had “Uptown Funk” reach hit 14 weeks in 2015. “As It Was” becomes only the fourth song in the 64-year history of the chart to remain at No. 1 for at least 15 weeks. The longest run belongs to Lil Nas X and Bi…