message: [XLA] Unescape the CSS embedded in a data URL in DOT before embedding it in SVG.
  This should unbreak graph styling for in-browser graph rendering.
diff: @@ -1461,6 +1461,9 @@ string WrapDotInHtml(absl::string_view dot) {
  var css_data = ''
  if (results !== null) {
  css_data = results[1].replace(/\s*data:.*\s*,/,''); // Strip content-type field.
  + // CSS inside DOT is URL-escaped, so we must unescape it
  + // before we can insert it into SVG.
  + css_data = unescape(css_data);
  dot_data = data.replace(cssregex, ''); // Remove the stylesheet
  }
  