Remove backends.

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

Index: compiler/java/com/google/dart/compiler/backend/js/ast/JsBreak.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/ast/JsBreak.java b/compiler/java/com/google/dart/compiler/backend/js/ast/JsBreak.java
deleted file mode 100644
index 363f294df78aade8b33ae7731f71c724f300cfcd..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/js/ast/JsBreak.java
+++ /dev/null
@@ -1,46 +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;
-
-/**
- * Represents the JavaScript break statement.
- */
-public final class JsBreak extends JsStatement {
-
-  private final JsNameRef label;
-
-  public JsBreak() {
-    this(null);
-  }
-
-  public JsBreak(JsNameRef label) {
-    super();
-    this.label = label;
-  }
-
-  public JsNameRef getLabel() {
-    return label;
-  }
-
-  @Override
-  public void traverse(JsVisitor v, JsContext ctx) {
-    if (v.visit(this, ctx)) {
-      if (label != null) {
-        v.accept(label);
-      }
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public boolean unconditionalControlBreak() {
-    return true;
-  }
-
-  @Override
-  public NodeKind getKind() {
-    return NodeKind.BREAK;
-  }
-}