Remove backends.

compiler/javatests/com/google/dart/compiler/backend/js/FlatteningVisitor.java

Index: compiler/javatests/com/google/dart/compiler/backend/js/FlatteningVisitor.java
diff --git a/compiler/javatests/com/google/dart/compiler/backend/js/FlatteningVisitor.java b/compiler/javatests/com/google/dart/compiler/backend/js/FlatteningVisitor.java
deleted file mode 100644
index b50515ad0245197bdb8a5dc42a8b2d7d198a8ab6..0000000000000000000000000000000000000000
--- a/compiler/javatests/com/google/dart/compiler/backend/js/FlatteningVisitor.java
+++ /dev/null
@@ -1,53 +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.backend.js;
-
-import com.google.dart.compiler.backend.js.ast.JsStatement;
-import com.google.dart.compiler.backend.js.ast.JsVisitable;
-import com.google.dart.compiler.backend.js.ast.JsVisitor;
-
-import java.util.ArrayList;
-import java.util.Iterator;
-import java.util.List;
-
-class FlatteningVisitor extends JsVisitor {
-
-  public static TreeNode exec(List<JsStatement> statements) {
-    FlatteningVisitor visitor = new FlatteningVisitor();
-    visitor.acceptList(statements);
-    return visitor.root;
-  }
-
-  public static class TreeNode {
-    public final JsVisitable node;
-    public final List<TreeNode> children = new ArrayList<TreeNode>();
-
-    public TreeNode(JsVisitable node) {
-      this.node = node;
-    }
-  }
-
-  private TreeNode root;
-
-  private FlatteningVisitor() {
-    root = new TreeNode(null);
-  }
-
-  protected <T extends JsVisitable> T doAccept(T node) {
-    TreeNode oldRoot = root;
-    root = new TreeNode(node);
-    oldRoot.children.add(root);
-    super.doAccept(node);
-    root = oldRoot;
-    return node;
-  }
-
-  // @Override
-  protected <T extends JsVisitable> void doAcceptList(List<T> collection) {
-    for (Iterator<T> it = collection.iterator(); it.hasNext();) {
-      doAccept(it.next());
-    }
-  }
-}