FetcherService = function($http, LovefieldService) {
  this.http_ = $http;
  this.dataFetcher_ = new NetworkDataFetcher(this.http_);
  this.lovefieldService_ = LovefieldService;

  this.db_ = null;

  // Populate DB with data.
  this.whenInitialized_ = this.init_().then(
      function() {
        console.log('DB populated with data.');
      }.bind(this));
}
A Serivce used for populating the DB with real-world data.
@constructor

@param {!angular.$http} $http
@param {!LovefieldService} LovefieldService