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

test/webkit/class-syntax-expression.js

Index: test/webkit/class-syntax-expression.js
diff --git a/test/webkit/class-syntax-expression.js b/test/webkit/class-syntax-expression.js
index 3272b81f7e339aa6b0711f32dfcad4a04aafc0fa..182afb1ff0ff35776f9a7739e8d5ef3e6ec052c1 100644
--- a/test/webkit/class-syntax-expression.js
+++ b/test/webkit/class-syntax-expression.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 expressions');