Fix for Issue 7224

sdk/lib/_internal/compiler/implementation/js_backend/emitter_no_eval.dart

 // Copyright (c) 2012, 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.
 
 part of js_backend;
 
 class CodeEmitterNoEvalTask extends CodeEmitterTask {
   CodeEmitterNoEvalTask(Compiler compiler,
                         Namer namer,
                         bool generateSourceMap)
@@ skipping 105 matching lines @@
 
     List<String> argumentNames = fields;
     if (fields.length < ($z - $a)) {
       argumentNames = new List<String>(fields.length);
       for (int i = 0; i < fields.length; i++) {
         argumentNames[i] = new String.fromCharCodes([$a + i]);
       }
     }
     String constructorName = namer.safeName(classElement.name.slowToString());
     // Generate the constructor.
-    buffer.add("'': function $constructorName(");
+    buffer.add('"": function $constructorName(');
     buffer.add(Strings.join(argumentNames, ", "));
     buffer.add(") {\n");
     for (int i = 0; i < fields.length; i++) {
       buffer.add("  this.${fields[i]} = ${argumentNames[i]};\n");
     }
     buffer.add(' }');
   }
 
+  void emitSuper(String superName, CodeBuffer buffer) {
+    if (superName != '') {
+      buffer.add(",\n 'super': '$superName'");
+    }
+  }
+
   void emitClassFields(ClassElement classElement,
                        CodeBuffer buffer,
                        bool emitEndingComma,
                        { String superClass: "",
                          bool isNative: false}) {
     if (emitEndingComma) buffer.add(', ');
   }
 
   bool getterAndSetterCanBeImplementedByFieldSpec(Element member,
                                                   String name,
                                                   bool needsGetter,
                                                   bool needsSetter) {
     return false;
   }
 }