Remove backends.

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

Index: compiler/java/com/google/dart/compiler/backend/js/ast/HasArguments.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/ast/HasArguments.java b/compiler/java/com/google/dart/compiler/backend/js/ast/HasArguments.java
deleted file mode 100644
index 2b880f7c86cb9e6fd2cdda713afb5b23990d57e7..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/js/ast/HasArguments.java
+++ /dev/null
@@ -1,15 +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;
-
-import java.util.List;
-
-/**
- * Implemented by JavaScript objects that accept arguments.
- */
-public interface HasArguments {
-
-  List<JsExpression> getArguments();
-}