[es6] Remove harmony-classes flag

test/mjsunit/strong/declaration-after-use.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --strong-mode --harmony_rest_parameters --harmony_arrow_functions --harmony_classes --harmony_computed-property_names
+// Flags: --strong-mode --harmony-rest-parameters --harmony-arrow-functions
+// Flags: --harmony-computed-property-names
 
 // Note that it's essential for these tests that the reference is inside dead
 // code (because we already produce ReferenceErrors for run-time unresolved
 // variables and don't want to confuse those with strong mode errors). But the
 // errors should *not* be inside lazy, unexecuted functions, since lazy parsing
 // doesn't produce strong mode scoping errors).
 
 // In addition, assertThrows will call eval and that changes variable binding
 // types (see e.g., UNBOUND_EVAL_SHADOWED). We can avoid unwanted side effects
 // by wrapping the code to be tested inside an outer function.
@@ skipping 234 matching lines @@
       }
       return new CInner();
     }
   }
   (new COuter()).m().n();
 
   // Making sure the check which is supposed to prevent "object literal inside
   // computed property name references the class name" is not too generic:
   class C14 { m() { let obj = { n() { C14 } }; obj.n(); } }; (new C14()).m();
 })();