Prevent Google Maps from loading the Roboto font.

prevent-roboto.js

var head = document.getElementsByTagName( 'head' )[0];

// Save the original method
var insertBefore = head.insertBefore;

// Replace it!
head.insertBefore = function( newElement, referenceElement ) {

    if ( newElement.href && newElement.href.indexOf( 'https://fonts.googleapis.com/css?family=Roboto' ) === 0 ) {
        return;
    }

    insertBefore.call( head, newElement, referenceElement );
};