Remove backends.

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

Index: compiler/java/com/google/dart/compiler/backend/js/ast/JsBlock.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/ast/JsBlock.java b/compiler/java/com/google/dart/compiler/backend/js/ast/JsBlock.java
deleted file mode 100644
index 39d1e356b2d110fcf25eccd7f864ced36e7d7775..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/js/ast/JsBlock.java
+++ /dev/null
@@ -1,44 +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.ArrayList;
-import java.util.List;
-
-/**
- * Represents a JavaScript block statement.
- */
-public class JsBlock extends JsStatement {
-
-  private final List<JsStatement> stmts = new ArrayList<JsStatement>();
-
-  public JsBlock() {
-  }
-
-  public JsBlock(JsStatement stmt) {
-    stmts.add(stmt);
-  }
-
-  public List<JsStatement> getStatements() {
-    return stmts;
-  }
-
-  public boolean isGlobalBlock() {
-    return false;
-  }
-
-  @Override
-  public void traverse(JsVisitor v, JsContext ctx) {
-    if (v.visit(this, ctx)) {
-      v.acceptWithInsertRemove(stmts);
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public NodeKind getKind() {
-    return NodeKind.BLOCK;
-  }
-}