Normalize the app media query tokens in place.

@inner
@param {Array.<string>} tokens the tokens to normalize
function normalizeAppMediaQueryTokens(tokens) {
    for (let i = tokens.length - 1; i >= 0; i--) {
        let item = tokens[i].trim();
        if (item && item !== '(') {
            break;
        }

        tokens.pop();
    }
}