Miscellaneous runtime fixes.

tool/input_sdk/private/ddc_runtime/classes.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// This library defines the operations that define and manipulate Dart
 /// classes.  Included in this are:
 ///   - Generics
 ///   - Class metadata
 ///   - Extension methods
 ///
@@ skipping 266 matching lines @@
 }
 
 defineExtensionNames(names) =>
     JS('', '#.forEach(#)', names, getExtensionSymbol);
 
 // Install properties in prototype order.  Properties / descriptors from
 // more specific types should overwrite ones from less specific types.
 _installProperties(jsProto, extProto) {
   var coreObjProto = JS('', '#.prototype', Object);
   if (JS('bool', '# === #', extProto, coreObjProto)) {
-    // core.Object members need to be copied from the non-symbol name to the
-    // symbol name.
-    for (var name in getOwnPropertyNames(coreObjProto)) {
+     // core.Object members need to be copied from the non-symbol name to the
+     // symbol name.
+    var names = getOwnPropertyNames(coreObjProto);
+    for (int i = 0; i < JS('int', '#.length', names); ++i) {
+      var name = JS('', '#[#]', names, i);
       var desc = getOwnPropertyDescriptor(coreObjProto, name);
       defineProperty(jsProto, getExtensionSymbol(name), desc);
     }
     return;
   }
   if (JS('bool', '# !== #', jsProto, extProto)) {
     _installProperties(jsProto, JS('', '#.__proto__', extProto));
-  }
+   }
   copyTheseProperties(jsProto, extProto, getOwnPropertySymbols(extProto));
 }
-
+ 
 ///
 /// Copy symbols from the prototype of the source to destination.
 /// These are the only properties safe to copy onto an existing public
 /// JavaScript class.
 ///
 registerExtension(jsType, dartExtType) => JS('', '''(() => {
   // TODO(vsm): Not all registered js types are real.
   if (!jsType) return;
 
   let extProto = $dartExtType.prototype;
@@ skipping 75 matching lines @@
 })()''');
 
 /// Sets the element type of a list literal.
 list(obj, elementType) =>
     JS('', '$setType($obj, ${getGenericClass(JSArray)}($elementType))');
 
 setBaseClass(derived, base) => JS('', '''(() => {
   // Link the extension to the type it's extending as a base class.
   $derived.prototype.__proto__ = $base.prototype;
 })()''');