Dark Chocolate reduces blood pressure?

Now dark chocolate which is rich in flavonoids is supposed to lower blood pressure? In the study:

For 15 days, half ate a daily 3.5 ounce (100 gram) bar of specially formulated, flavonoid-rich dark chocolate, while the other half ate the same amount of white chocolate.

This specially formulated bar is just what chocolateers like Hershey's and Cadbury needs to come out with. Some kind of healthy chocolate bar that is rich with flavonoids and is good for reducing blood pressure. Call it the Flavo-Bar or something like that.