Remove backends.

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

Index: compiler/java/com/google/dart/compiler/backend/js/ast/JsGlobalBlock.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/ast/JsGlobalBlock.java b/compiler/java/com/google/dart/compiler/backend/js/ast/JsGlobalBlock.java
deleted file mode 100644
index 9a14004e14c14db43b6d187cd62986b8fb79824a..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/js/ast/JsGlobalBlock.java
+++ /dev/null
@@ -1,19 +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;
-
-/**
- * Represnts a JavaScript block in the global scope.
- */
-public class JsGlobalBlock extends JsBlock {
-
-  public JsGlobalBlock() {
-  }
-
-  @Override
-  public boolean isGlobalBlock() {
-    return true;
-  }
-}