Remove the global Strength enum class completely.

src/js/v8natives.js

 // Copyright 2012 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.
 
 (function(global, utils) {
 
 %CheckIsBootstrapping();
 
 // ----------------------------------------------------------------------------
 // Imports
@@ skipping 555 matching lines @@
           if (should_throw) {
             throw MakeTypeError(kRedefineDisallowed, p);
           } else {
             return false;
           }
         }
         // Step 10a
         if (IsDataDescriptor(current) && IsDataDescriptor(desc)) {
           var currentIsWritable = current.isWritable();
           if (currentIsWritable != desc.isWritable()) {
-            if (!currentIsWritable || IS_STRONG(obj)) {
+            if (!currentIsWritable) {
               if (should_throw) {
-                throw currentIsWritable
-                    ? MakeTypeError(kStrongRedefineDisallowed, obj, p)
-                    : MakeTypeError(kRedefineDisallowed, p);
+                throw MakeTypeError(kRedefineDisallowed, p);
               } else {
                 return false;
               }
             }
           }
           if (!currentIsWritable && desc.hasValue() &&
               !%SameValue(desc.getValue(), current.getValue())) {
             if (should_throw) {
               throw MakeTypeError(kRedefineDisallowed, p);
             } else {
@@ skipping 509 matching lines @@
   to.ObjectDefineProperties = ObjectDefineProperties;
   to.ObjectDefineProperty = ObjectDefineProperty;
   to.ObjectHasOwnProperty = GlobalObject.prototype.hasOwnProperty;
 });
 
 %InstallToContext([
   "object_value_of", ObjectValueOf,
 ]);
 
 })