Remove backends.

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

Index: compiler/java/com/google/dart/compiler/backend/js/ast/JsProgramFragment.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/ast/JsProgramFragment.java b/compiler/java/com/google/dart/compiler/backend/js/ast/JsProgramFragment.java
deleted file mode 100644
index 3c6859e21500c688f9a261520770d969211c8503..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/js/ast/JsProgramFragment.java
+++ /dev/null
@@ -1,34 +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;
-
-/**
- * One independently loadable fragment of a {@link JsProgram}.
- */
-public class JsProgramFragment extends JsNode {
-
-  private final JsGlobalBlock globalBlock;
-
-  public JsProgramFragment() {
-    this.globalBlock = new JsGlobalBlock();
-  }
-
-  public JsBlock getGlobalBlock() {
-    return globalBlock;
-  }
-
-  @Override
-  public void traverse(JsVisitor v, JsContext ctx) {
-    if (v.visit(this, ctx)) {
-      v.accept(globalBlock);
-    }
-    v.endVisit(this, ctx);
-  }
-
-  @Override
-  public NodeKind getKind() {
-    return NodeKind.PROGRAM_FRAGMENT;
-  }
-}