Use ASTVisitor as in new AST.

editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/dom/PropertyGetter.java

Index: editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/dom/PropertyGetter.java
diff --git a/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/dom/PropertyGetter.java b/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/dom/PropertyGetter.java
index d0ad72164a8544d858ecbf7e351cd51119e4a6c9..a55a115aef28db76de3ebca155381d63cf1714a0 100644
--- a/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/dom/PropertyGetter.java
+++ b/editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/dom/PropertyGetter.java
@@ -219,7 +219,7 @@ public class PropertyGetter extends PropertyVisitor {
   }
 
   @Override
-  public <N extends DartExpression> Object visitClassMember(DartClassMember<N> node) {
+  public Object visitClassMember(DartClassMember<?> node) {
     if (property == PropertyDescriptorHelper.DART_CLASS_MEMBER_MODIFIERS) {
       return node.getModifiers();
     } else if (property == PropertyDescriptorHelper.DART_CLASS_MEMBER_NAME) {
@@ -229,6 +229,7 @@ public class PropertyGetter extends PropertyVisitor {
     }
   }
 
+  @Override
   public Object visitComment(DartComment node) {
     return visitNode(node);
   }
@@ -256,6 +257,7 @@ public class PropertyGetter extends PropertyVisitor {
     return visitSwitchMember(node);
   }
 
+  @Override
   public Object visitDirective(DartDirective node) {
     return visitNode(node);
   }