message: fix neglible race when loading CSS
diff: @@ -931,8 +931,15 @@ module.exports = React.createClass({
  Tinter.tint(colors[0], colors[1]);
  };
  + // turns out that Firefox preloads the CSS for link elements with
  + // the disabled attribute, but Chrome doesn't.
  +
  let cssLoaded = false;
  + styleElements[theme].onload = () => {
  + switchTheme();
  + };
  +
  for (let i = 0; i < document.styleSheets.length; i++) {
  const ss = document.styleSheets[i];
  if (ss && ss.href === styleElements[theme].href) {
  @@ -942,11 +949,8 @@ module.exports = React.createClass({
  }
  if (cssLoaded) {
  + styleElements[theme].onload = undefined;
  switchTheme();
  - } else {
  - styleElements[theme].onload = () => {
  - switchTheme();
  - };
  }
  if (theme === 'dark') {
  