Brad Marchand's goal called back due to offsides, then scores another to win the game

Today in the third period, Brad Marchand and Patrice Bergeron broke into the Leafs zone and Bergeron put the puck perfectly on Marchand's tape for a beatiful tap-in goal. Here it is:

The goal was challenged and called back. Here's the review:

Do you think that's the right call?

UPDATE: Brad Marchand did score a heck of a goal later in the period. He cannot be stopped, apparently:

Clips collected by CrzyCanucklehead