If you want to disable these, you need to dequeue them. If you look at the functions.php file from the parent theme, you'll see here on line 90 you have this function called twentytwelve_scripts_styles. Inside this function you have several scripts that are enqueued so that WordPress can use them. You see one here, wp_enqueue_script ( 'comment-reply' ), directly below it wp_enqueue_script( 'twentytwelve_ navigation, and this last one is the one the calls in the custom Opens Sans font from Google Fonts that was the default in the theme before we changed it.
So what does it mean when it says that a script or a style is enqueued? Well, it means that WordPress is calling it into the theme without specifying it in the header.php file or footer.php file or anywhere else. For example, we can see here that the style for this Open Sans font is being enqueued. But if you go into the header.php file, you won't find any reference to the style sheet for this Google font. However, when you load the page and then go look at the code behind the scenes, you'll see that here, on line 20, you have the style sheet directly from fonts.googleapis.com, which means the font is being called in, but it's being called in through the enqueue function.
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