In Jim Harbaugh's first season as head coach in 2011, the 49ers feasted on turnovers.San Francisco had 38 takeaways from opponents, while giving up the ball just 10 times for a plus-28 turnover mark, one of the best in NFL history.This season began with a much different theme.After three games, San Francisco was reeling after two straight losses and was minus-4 in turnover differential, having turned the ball over seven times.But over the past month, the 49ers have done a complete turnaround. The Niners are on a four-game winning streak as they head to London for a game Sunday against the winless Jacksonville Jaguars, and one of the keys to their regained momentum has been turnovers.The 49ers are back to forcing them – and taking advantage of them – while holding on tight to the football themselves.Over that four-game winning streak, the Niners have taken the ball away 12 times and turned each interception and fumble recovery into points, scoring eight touchdowns and kicking four field goals.For the season, the 49ers now rank tied for seventh in the NFC with a plus-4 takeaway-giveaway margin.And, in Sunday's 31-17 victory over the Titans in Tennessee, the 49ers cashed...