Robby Takac calls them “car-seat hostages.”They are the kids that were first introduced to the music of the Goo Goo Dolls in their parents’ cars and minivans, helplessly strapped in while the band’s softer hits played on an endless loop on the radio.“We were on the radio all the time, so they heard our songs constantly,” says Takac, the Goo Goo Dolls bassist who co-founded the band with singer-guitarist Johnny Rzeznik in the mid-1980s. “But the songs they heard were Slide and Broadway and Iris and Name. But a lot of kids now are starting to discover records that we put out in the early ’90s th