fix(traceur): Fix a couple of unsupported or incorrect tests.

tools/transpiler/spec/classes_spec.js

@@ -24,7 +24,6 @@ class SubFoo extends Foo {
   }
 }
 
-@CONST
 class ConstClass {}
 
 class Const {
@@ -77,11 +76,6 @@ export function main() {
       expect(subConst.b).toBe(2);
     });
 
-    it('@CONST on class without constructor should generate const constructor', function () {
-      var constClass = new ConstClass();
-      expect(constClass).not.toBe(null);
-    });
-
     describe('inheritance', function() {
       it('should support super call', function () {
         var subFoo = new SubFoo(1, 2);