[tests] Fix webkit class syntax tests to handle destructuring binding

test/webkit/class-syntax-declaration.js

Index: test/webkit/class-syntax-declaration.js
diff --git a/test/webkit/class-syntax-declaration.js b/test/webkit/class-syntax-declaration.js
index 3c9aed7441e359838a22667f368ffc5c9831efca..f8ecdbb15191cca3f7f8cc07c5c863ad7f88c932 100644
--- a/test/webkit/class-syntax-declaration.js
+++ b/test/webkit/class-syntax-declaration.js
@@ -21,7 +21,7 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --harmony-sloppy
+// Flags: --harmony-sloppy --harmony-destructuring-bind
 
 description('Tests for ES6 class syntax declarations');