Delete the font face declaration before updating this CSS file:
@font-face {
    font-family: WebComponentsIcons;
    src: url(fonts/glyphs/WebComponentsIcons.eot?gedxeo);
    src: url(fonts/glyphs/WebComponentsIcons.eot?gedxeo#iefix) format('embedded-opentype'),url(fonts/glyphs/WebComponentsIcons.ttf?gedxeo) format('truetype'),url(fonts/glyphs/WebComponentsIcons.woff?gedxeo) format('woff'),url(fonts/glyphs/WebComponentsIcons.svg?gedxeo#WebComponentsIcons) format('svg');
    font-weight: 400;
    font-style: normal
}