Insecure stylesheet font in dw-brickstore Theme

Hi,
I’m using dw-brickstore child theme and found insecure content in Google Chrome, I noticed that’s was problem with htpp googgle font
@import url(http://fonts.googleapis.com/css?family=Montserrat:400,700);/*!
I’ve changed in main theme to
@import url(//fonts.googleapis.com/css?family=Montserrat:400,700);
 
It works when i change in main theme, but when i updating child theme files, it still showing insecure content, 
Is it possible to update this in child theme to avoid overwrite updates ?
Thanks