Remove backends.

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

Index: compiler/java/com/google/dart/compiler/backend/js/ast/JsNode.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/ast/JsNode.java b/compiler/java/com/google/dart/compiler/backend/js/ast/JsNode.java
deleted file mode 100644
index 2856ad8a008f5b1eff4f58e7e8dc8ce82ff8f676..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/js/ast/JsNode.java
+++ /dev/null
@@ -1,51 +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 com.google.dart.compiler.backend.js.JsSourceGenerationVisitor;
-import com.google.dart.compiler.backend.js.JsToStringGenerationVisitor;
-import com.google.dart.compiler.common.AbstractNode;
-import com.google.dart.compiler.common.SourceInfo;
-import com.google.dart.compiler.util.DefaultTextOutput;
-
-/**
- * Base class for all JS AST elements.
- */
-public abstract class JsNode extends AbstractNode implements JsVisitable {
-
-  protected JsNode() {
-  }
-
-  // Causes source generation to delegate to the one visitor
-  public final String toSource() {
-    DefaultTextOutput out = new DefaultTextOutput(false);
-    JsSourceGenerationVisitor v = new JsSourceGenerationVisitor(out);
-    v.accept(this);
-    return out.toString();
-  }
-
-  // Causes source generation to delegate to the one visitor
-  @Override
-  public final String toString() {
-    DefaultTextOutput out = new DefaultTextOutput(false);
-    JsToStringGenerationVisitor v = new JsToStringGenerationVisitor(out);
-    v.accept(this);
-    return out.toString();
-  }
-
-  @Override
-  public SourceInfo getSourceInfo() {
-    return this;
-  }
-
-  public JsNode setSourceRef(SourceInfo info) {
-    if (info != null) {
-      this.setSourceInfo(info);
-    }
-    return this;
-  }
-
-  public abstract NodeKind getKind();
-}