Remove dartc optimizing backend.

dart/compiler/java/com/google/dart/compiler/backend/js/ClosureJsAst.java

Index: dart/compiler/java/com/google/dart/compiler/backend/js/ClosureJsAst.java
diff --git a/dart/compiler/java/com/google/dart/compiler/backend/js/ClosureJsAst.java b/dart/compiler/java/com/google/dart/compiler/backend/js/ClosureJsAst.java
deleted file mode 100644
index 0be722c625f15269c3a5f4f1f43bc7b679d5ddab..0000000000000000000000000000000000000000
--- a/dart/compiler/java/com/google/dart/compiler/backend/js/ClosureJsAst.java
+++ /dev/null
@@ -1,79 +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;
-
-import com.google.dart.compiler.Source;
-import com.google.dart.compiler.backend.js.ast.JsProgram;
-import com.google.javascript.jscomp.AbstractCompiler;
-import com.google.javascript.jscomp.SourceAst;
-import com.google.javascript.jscomp.SourceFile;
-import com.google.javascript.rhino.InputId;
-import com.google.javascript.rhino.Node;
-
-/**
- * Maps the DartC AST to a Closure Compiler input source.
- *
- * @author johnlenz@google.com (John Lenz)
- */
-public class ClosureJsAst implements SourceAst {
-
-  private static final long serialVersionUID = 1L;
-
-  /*
-   * Root node of internal JS Compiler AST which represents the same source.
-   * In order to get the tree, getAstRoot() has to be called.
-   */
-  private Node root;
-  private final JsProgram program;
-  private final Source source;
-  private final InputId inputId;
-
-  private final boolean validate;
-
-  public ClosureJsAst(JsProgram program, String inputName, Source source, boolean validate) {
-    assert(inputName != null);
-    this.program = program;
-    this.source = source;
-    this.inputId = new InputId(inputName);
-    this.validate = validate;
-  }
-
-  @Override
-  public void clearAst() {
-    root = null;
-  }
-
-  @Override
-  public Node getAstRoot(AbstractCompiler compiler) {
-    if (root == null) {
-      createAst(compiler);
-    }
-    return root;
-  }
-
-  @Override
-  public InputId getInputId() {
-    return inputId;
-  }
-
-  @Override
-  public SourceFile getSourceFile() {
-    return null;
-  }
-
-  @Override
-  public void setSourceFile(SourceFile file) {
-    throw new UnsupportedOperationException(
-        "ClosureJsAst cannot be associated with a SourceFile instance.");
-  }
-
-  public String getSourceName() {
-    return source.getName();
-  }
-
-  private void createAst(AbstractCompiler compiler) {
-    root = new ClosureJsAstTranslator(validate).translate(program, inputId, source);
-  }
-}