Remove dartc optimizing backend.

dart/compiler/javatests/com/google/dart/compiler/backend/js/ExprOptTest.java

Index: dart/compiler/javatests/com/google/dart/compiler/backend/js/ExprOptTest.java
diff --git a/dart/compiler/javatests/com/google/dart/compiler/backend/js/ExprOptTest.java b/dart/compiler/javatests/com/google/dart/compiler/backend/js/ExprOptTest.java
deleted file mode 100644
index 68f2f8a3f709b09cc8bdd379d86443f6ed86089e..0000000000000000000000000000000000000000
--- a/dart/compiler/javatests/com/google/dart/compiler/backend/js/ExprOptTest.java
+++ /dev/null
@@ -1,30 +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;
-
-/**
- * Tests for binary expression optimizations.
- */
-public abstract class ExprOptTest extends SnippetTestCase {
-
-  private JavascriptBackend jsBackend = new JavascriptBackend() {
-    @Override
-    protected boolean shouldOptimize() {
-      // We're testing the optimizer here, so turn it on explicitly.
-      return true;
-    }
-  };
-
-  @Override
-  protected AbstractJsBackend getBackend() {
-    return jsBackend;
-  }
-
-  @Override
-  protected void tearDown() throws Exception {
-    jsBackend = null;
-    super.tearDown();
-  }
-}