Combination of things. Much of their luck, they earned. Last ditch tackles and blocks, goalie of the tournament (which isn't luck, it's just that their best player by a distance was their goalie - how many saves did he also make from offside players!). But they also had the Dutch running out of ideas for much of that second half. They kept their shape and discipline and defended stoutly - those 11 corners were mostly the result of good defending snuffing out an attack. I would say that they rode their luck in the last 5 minutes of normal time, but I also think the Dutch then rode their luck in extra time - could have gone either way in extra time, I think, and credit to CR for that.
The Dutch then struck five brilliant pens in the shootout. That I do give them credit for.
(On another night, CR would have ended with 10 men, mind. They were a little fortunate to keep all 11 on the pitch.)