Quick fixes 'Create class' and 'Create constructor'

compiler/java/com/google/dart/compiler/resolver/ClassElementUnion.java

 // 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.
 
 package com.google.dart.compiler.resolver;
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.Lists;
 import com.google.dart.compiler.ast.DartObsoleteMetadata;
@@ skipping 175 matching lines @@
     for (InterfaceType type : types) {
       typeMembers.add(type.getElement().getMembers());
     }
     return Iterables.concat(typeMembers);
   }
 
   @Override
   public List<ConstructorNodeElement> getConstructors() {
     throw new UnsupportedOperationException();
   }
+
+  @Override
+  public int getOpenBraceOffset() {
+    return -1;
+  }
+  
+  @Override
+  public int getCloseBraceOffset() {
+    return -1;
+  }
 }