function contentLoaded(error, content, contentEncoded)
        {
            if (error || content === null) {
                replyWithContent.call(this, null, false);
                return;
            }
            replyWithContent.call(this, content, contentEncoded);
        }
@param {?Protocol.Error} error
@param {?string} content
@param {boolean} contentEncoded
@this {WebInspector.Resource}