remove unneeded @transactional in GoogleOAuth2Service

GoogleOAuth2Service is just an OAuth provider descriptor class, no transaction is actually involved.

Author: yohannrub

grails-app/services/grails/plugin/springsecurity/oauth2/google/GoogleOAuth2Service.groovy

@@ -4,13 +4,11 @@ import com.github.scribejava.apis.GoogleApi20
 import com.github.scribejava.core.builder.api.DefaultApi20
 import com.github.scribejava.core.model.OAuth2AccessToken
 import grails.converters.JSON
-import grails.gorm.transactions.Transactional
 import grails.plugin.springsecurity.oauth2.exception.OAuth2Exception
 import grails.plugin.springsecurity.oauth2.service.OAuth2AbstractProviderService
 import grails.plugin.springsecurity.oauth2.token.OAuth2SpringToken
 import groovy.util.logging.Slf4j
 
-@Transactional
 @Slf4j
 class GoogleOAuth2Service extends OAuth2AbstractProviderService {