Cors Api Google

I have the following request in the Google API using $ http AngularJS:

$http.get('http://maps.googleapis.com/maps/api/distancematrix/json?origins=Porto Alegre&destinations=Sao Paulo&mode=driving&language=pt-BR&sensor=false');

The problem is that it returns the error:

  

XMLHttpRequest can not load    link .   In 'Access-Control-Allow-Origin' header is present on the requested   resource. Origin ' link ' is therefore not allowed   access. The response had HTTP status code 405.

I know it's CORS already tried to put this code in the angle:

moduloVistoria.config(['$httpProvider', function($httpProvider) {
    $httpProvider.defaults.useXDomain = true;
    delete $httpProvider.defaults.headers.common['X-Requested-With'];
}]);

But nothing works. My backend is in PHP and I've already put it:

header("Access-Control-Allow-Origin: *");

Can anyone tell me what might be happening?