Remove backends.

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

Index: compiler/java/com/google/dart/compiler/backend/js/ast/JsReturn.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/ast/JsReturn.java b/compiler/java/com/google/dart/compiler/backend/js/ast/JsReturn.java
deleted file mode 100644
index 16d90e4b353b38c25ba7280227d3e8ad1c161913..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/js/ast/JsReturn.java
+++ /dev/null
@@ -1,48 +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 return statement.
- */
-public final class JsReturn extends JsStatement {
-
-  private JsExpression expr;
-
-  public JsReturn() {
-  }
-
-  public JsReturn(JsExpression expr) {
-    this.expr = expr;
-  }
-
-  public JsExpression getExpr() {
-    return expr;
-  }
-
-  public void setExpr(JsExpression expr) {
-    this.expr = expr;
-  }
-
-  @Override
-  public void traverse(JsVisitor v, JsContext ctx) {
-    if (v.visit(this, ctx)) {
-      if (expr != null) {
-        expr = v.accept(expr);
-      }
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public boolean unconditionalControlBreak() {
-    return true;
-  }
-
-  @Override
-  public NodeKind getKind() {
-    return NodeKind.RETURN;
-  }
-}