How to remove the Google Fonts API call from EasyCart plugin

[tearslake]

My website speed test shows the following call to Google API. I have searched my website and found that it is in the file plugins/wp-easycart/wpeasycart.php

• https://fonts.googleapis.com/css?fam...|Droid%20Serif

I'd like to disable all calls to Google. I can store the fonts locally or just default to web-safe fonts, it does not matter to me, but I'd like to start with just disabling the calls to Google. How would I go about it?
I've got the following plugins installed:
WP EasyCart
WP EasyCart PRO
WP EasyCart Weight Minimum
WordPress 4.9.7 running Shop Isle theme. Website address: https://farmqueenfoods.ca

[tearslake]

If anybody else is interested I've got the google API call removed by the following code in functions.php file in my child theme (deregister and dequeue):

function deregister_styles() {
wp_deregister_style( 'wpeasycart_gfont' );
}
add_action( 'wp_print_styles', 'deregister_styles', 100 );
function wpse_dequeue_google_fonts() {
wp_dequeue_style( 'wpeasycart_gfont' );
}
add_action( 'wp_enqueue_scripts', 'wpse_dequeue_google_fonts', 20 );