function $getProvider() {
  return [
    '$rootElement', '$rootScope', '$injector', '$window',
    function($rootElement, $rootScope, $injector, $window) {
      return new MdPanelService(_presets, $rootElement, $rootScope,
          $injector, $window);
    }
  ];
}
Represents the `$get` method of the AngularJS provider. From here, a new
reference to the MdPanelService is returned where the needed arguments are
passed in including the MdPanelProvider `_presets`.
@param {!Object} _presets
@param {!JQLite} $rootElement
@param {!angular.Scope} $rootScope
@param {!IInjectorService} $injector
@param {!IWindowService} $window