src/cordova/util.js
function removePlatformPluginsJson (projectRoot, target) {
    var plugins_json = path.join(projectRoot, 'plugins', target + '.json');
    fs.removeSync(plugins_json);
}
function removePlatformPluginsJson (projectRoot, target) {
    var plugins_json = path.join(projectRoot, 'plugins', target + '.json');
    fs.removeSync(plugins_json);
}
Remove <platform>.json file from plugins directory.