At 16:15 of the first period in the Maple Leafs/Ducks game, Anaheim requested a Coach's Challenge to review whether Toronto was off-side before their goal.
After reviewing all available replays and consulting with the linesman, NHL Hockey Operations staff were inconclusive in determining whether Toronto was off-side prior to the goal. According to Rule 78.7, "If a review is not conclusive and/or there is any doubt whatsoever as to whether the call on the ice was correct, the On-Ice Official(s) will be instructed to confirm their original call."
Therefore the original call stands - good goal Toronto Maple Leafs.
Since the Coach's Challenge did not result in the original call being overturned, the Anaheim Ducks forfeit their time-out.