Remove dartc optimizing backend.

dart/compiler/javatests/com/google/dart/compiler/vm/LibTest.java

Index: dart/compiler/javatests/com/google/dart/compiler/vm/LibTest.java
diff --git a/dart/compiler/javatests/com/google/dart/compiler/vm/LibTest.java b/dart/compiler/javatests/com/google/dart/compiler/vm/LibTest.java
deleted file mode 100644
index fa268bca346b9e14f7e637e3a5e0541f6615ed11..0000000000000000000000000000000000000000
--- a/dart/compiler/javatests/com/google/dart/compiler/vm/LibTest.java
+++ /dev/null
@@ -1,18 +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.vm;
-
-public abstract class LibTest extends VmTest {
-
-  @Override
-  protected void runNegativeTest(String testName, String... commandArray) {
-    super.runNegativeTest(testName, commandArray);
-  }
-
-  @Override
-  protected void runPositiveTest(String testName, String... commandArray) throws Throwable {
-    super.runPositiveTest(testName, commandArray);
-  }
-}