Use Element instead of Symbol.

compiler/java/com/google/dart/compiler/ast/viz/BaseASTWriter.java

Index: compiler/java/com/google/dart/compiler/ast/viz/BaseASTWriter.java
diff --git a/compiler/java/com/google/dart/compiler/ast/viz/BaseASTWriter.java b/compiler/java/com/google/dart/compiler/ast/viz/BaseASTWriter.java
index cb43e5e6f6f74676de5fb67367c20177aef861a7..69eff1f04ac9da1bfcb77b6af1beb6cac95500cd 100644
--- a/compiler/java/com/google/dart/compiler/ast/viz/BaseASTWriter.java
+++ b/compiler/java/com/google/dart/compiler/ast/viz/BaseASTWriter.java
@@ -309,7 +309,7 @@ public abstract class BaseASTWriter {
 
     @Override
     public Object visitField(DartField node) {
-      write("DartField", node, node.getName().getTargetName());
+      write("DartField", node, node.getName().getName());
       visitChildren(node);
       return null;
     }
@@ -359,7 +359,7 @@ public abstract class BaseASTWriter {
 
     @Override
     public Object visitIdentifier(DartIdentifier node) {
-      write("DartIdentifier", node, node.getTargetName());
+      write("DartIdentifier", node, node.getName());
       visitChildren(node);
       return null;
     }