Google Fonts not working?

I followed this tutorial…

And it is still not working…. Here is the code I added to the bottom of the functions.php file.

add_filter( 'avf_google_heading_font', 'avia_add_heading_font');
function avia_add_heading_font($fonts)
{
$fonts['Source Sans Pro'] = 'Source+Sans+Pro:400,700,700italic,900,900italic,400italic,300,300italic';
return $fonts;
}

add_filter( 'avf_google_content_font', 'avia_add_content_font');
function avia_add_content_font($fonts)
{
$fonts['Source Sans Pro'] = 'Source+Sans+Pro:400,700,700italic,900,900italic,400italic,300,300italic';
return $fonts;
}

This was added to the very bottom. Please advise.