The documentation says "API getters should start with get. For instance getDefaultInterface. Setters should start with set. For instance setDefaultInterface". Please remove this because it is misleading. For getters and setters the framework provides properties:
Property<CookieJarParamsData>(_T("cookiejar"), &WebKitBrowser::get_cookiejar, &WebKitBrowser::set_cookiejar, this);