Remove AST dumps, useless for Editor

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

Index: compiler/java/com/google/dart/compiler/ast/viz/NullWriter.java
diff --git a/compiler/java/com/google/dart/compiler/ast/viz/NullWriter.java b/compiler/java/com/google/dart/compiler/ast/viz/NullWriter.java
deleted file mode 100644
index 49c3c5c183b965da451c365bc357d49d0735f72c..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/ast/viz/NullWriter.java
+++ /dev/null
@@ -1,35 +0,0 @@
-// Copyright (c) 2011, 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.ast.viz;
-
-import com.google.dart.compiler.ast.DartNode;
-import com.google.dart.compiler.ast.DartUnit;
-
-/**
- * Write the AST in Dot format. Output file is placed next to the JS file in the output directory
- */
-public class NullWriter extends BaseASTWriter {
-
-  public NullWriter(String outputDir) {
-    super(outputDir);
-  }
-
-  @Override
-  protected void startHook(DartUnit unit) {
-  }
-
-  @Override
-  protected void endHook(DartUnit unit) {
-  }
-
-  @Override
-  public void process(DartUnit unit) {
-    return;
-  }
-
-  @Override
-  protected void write(String nodeType, DartNode node, String data) {
-  }
-}