Remove backends.

compiler/java/com/google/dart/compiler/backend/js/ast/JsWhile.java

Index: compiler/java/com/google/dart/compiler/backend/js/ast/JsWhile.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/ast/JsWhile.java b/compiler/java/com/google/dart/compiler/backend/js/ast/JsWhile.java
deleted file mode 100644
index c40203bc1f10031324730c02b4d52b58bced22d7..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/js/ast/JsWhile.java
+++ /dev/null
@@ -1,52 +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.ast;
-
-/**
- * A JavaScript <code>while</code> statement.
- */
-public class JsWhile extends JsStatement {
-
-  private JsStatement body;
-  private JsExpression condition;
-
-  public JsWhile() {
-  }
-
-  public JsWhile(JsExpression condition, JsStatement body) {
-    this.condition = condition;
-    this.body = body;
-  }
-
-  public JsStatement getBody() {
-    return body;
-  }
-
-  public JsExpression getCondition() {
-    return condition;
-  }
-
-  public void setBody(JsStatement body) {
-    this.body = body;
-  }
-
-  public void setCondition(JsExpression condition) {
-    this.condition = condition;
-  }
-
-  @Override
-  public void traverse(JsVisitor v, JsContext ctx) {
-    if (v.visit(this, ctx)) {
-      condition = v.accept(condition);
-      body = v.accept(body);
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public NodeKind getKind() {
-    return NodeKind.WHILE;
-  }
-}