Add ClassDeclaration/ClassTypeAlias.isAbstract() and use them.

editor/util/plugins/com.google.dart.java2dart/src/com/google/dart/java2dart/processor/JUnitSemanticProcessor.java

 /*
  * Copyright (c) 2013, the Dart project authors.
  * 
  * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
  * in compliance with the License. You may obtain a copy of the License at
  * 
  * http://www.eclipse.org/legal/epl-v10.html
  * 
  * Unless required by applicable law or agreed to in writing, software distributed under the License
  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
@@ skipping 71 matching lines @@
     unit.accept(new GeneralizingAstVisitor<Void>() {
       @Override
       public Void visitClassDeclaration(ClassDeclaration node) {
         ITypeBinding typeBinding = context.getNodeTypeBinding(node);
         if (JavaUtils.isSubtype(typeBinding, "junit.framework.TestCase")) {
           // replace extends clause
           if (JavaUtils.isTypeNamed(typeBinding.getSuperclass(), "junit.framework.TestCase")) {
             node.setExtendsClause(extendsClause(typeName("JUnitTestCase")));
           }
           // generate "dartSuite"
-          if (node.getAbstractKeyword() == null) {
+          if (!node.isAbstract()) {
             generateDartSuite(node);
           }
         }
         return super.visitClassDeclaration(node);
       }
 
       @Override
       public Void visitMethodInvocation(MethodInvocation node) {
         super.visitMethodInvocation(node);
         SimpleIdentifier nameNode = node.getMethodName();
@@ skipping 79 matching lines @@
                 formalParameterList(),
                 blockFunctionBody(expressionStatement(groupInvocation))));
       }
 
       private boolean isJUnitAssertMethod(MethodInvocation node) {
         return JavaUtils.isMethodInClass(context.getNodeBinding(node), "junit.framework.Assert");
       }
     });
   }
 }