Post-merge fix: remove unnecessary flush privileges.

mysql-test/r/plugin_not_embedded.result

@@ -6,6 +6,5 @@ INSTALL PLUGIN example SONAME 'ha_example.so';
 UNINSTALL PLUGIN example;
 ERROR 42000: DELETE command denied to user 'bug51770'@'localhost' for table 'plugin'
 GRANT DELETE ON mysql.plugin TO bug51770@localhost;
-FLUSH PRIVILEGES;
 UNINSTALL PLUGIN example;
 DROP USER bug51770@localhost;

mysql-test/t/plugin_not_embedded.test

@@ -12,7 +12,6 @@ eval INSTALL PLUGIN example SONAME $HA_EXAMPLE_SO;
 UNINSTALL PLUGIN example;
 connection default;
 GRANT DELETE ON mysql.plugin TO bug51770@localhost;
-FLUSH PRIVILEGES;
 connection con1;
 UNINSTALL PLUGIN example;
 disconnect con1;