[REVIEW ONLY] Try to fix popup window.open() size

See https://github.com/adobe/brackets/issues/8768
See http://magpcss.org/ceforum/apidocs/projects/(default)/CefLifeSpanHandler.html#OnBeforePopup(CefRefPtr<CefBrowser>,constCefPopupFeatures&,CefWindowInfo&,constCefString&,CefRefPtr<CefClient>&,CefBrowserSettings&)