“OMG OMG,” Gwen Stefani sings in “Spark the Fire.” Hell, it’s 2014 and she’s OMG-ing and LOL-ing all over the place! At least she’s got emoji by her side: hearts and clouds and pizzas and mushrooms. It feels an awful lot like the Harajuku Gwen of yesteryear. It also sounds like the Gwen of yesteryear. Would you like another “Hollaback Girl”?