Update cleancss-browser.js to v2.2.9.
Update cleancss-browser.js to v2.2.9.

bryanerayner/html-minifier,psychoss/html-minifier,MacManus/html-minifier,DChristiany/html-minifier,DChristiany/html-minifier,AshKyd/html-minifier,psychoss/html-minifier,bryanerayner/html-minifier,GerHobbelt/html-minifier,jonnochoo/html-minifier,kangax/html-minifier,kangax/html-lint,MacManus/html-minifier,jonnochoo/html-minifier,GerHobbelt/html-minifier,kangax/html-lint,HossainKhademian/HtmlMinifier,AshKyd/html-minifier,kangax/html-minifier