code: function reloadCSSForDocument(doc, newContent) {
          var styles = styleForURL(doc.url),
              styleSheetId,
              deferreds = [];
  
          if (newContent === undefined) {
              newContent = doc.getText();
          }
          for (styleSheetId in styles) {
              deferreds.push(Inspector.CSS.setStyleSheetText(styles[styleSheetId].styleSheetId, newContent));
          }
          if (!deferreds.length) {
              console.error("Style Sheet for document not loaded: " + doc.url);
              return new $.Deferred().reject().promise();
          }
          // return master deferred
          return $.when.apply($, deferreds);
      }
docs: Reload a CSS style sheet from a document
  @param {Document} document
  @param {string=} newContent new content of every stylesheet. Defaults to doc.getText() if omitted
  @return {jQuery.Promise}