Remove backends.

compiler/javatests/com/google/dart/compiler/backend/js/testConstantExprOpt.dart

Index: compiler/javatests/com/google/dart/compiler/backend/js/testConstantExprOpt.dart
diff --git a/compiler/javatests/com/google/dart/compiler/backend/js/testConstantExprOpt.dart b/compiler/javatests/com/google/dart/compiler/backend/js/testConstantExprOpt.dart
deleted file mode 100644
index 42fec0a8835e61e09a74a0eb0428d86cda43ffb8..0000000000000000000000000000000000000000
--- a/compiler/javatests/com/google/dart/compiler/backend/js/testConstantExprOpt.dart
+++ /dev/null
@@ -1,35 +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.
-
-class Foo {
-  const Foo();
-}
-
-class A {
-  static final int C1 = 10 + C2 * 2; // 20
-  static final int C2 = 5;
-  static final Foo C3 = const Foo();
-  static int foo() { return 1; }
-}
-
-class Main {
-  static void main() {
-    int _marker_0, _marker_1, _marker_2;
-    Foo _marker_3;
-
-    final int x = 50;
-
-    _marker_0 = x * 2;
-
-    _marker_1 = A.C1 + 5;
-
-    _marker_2 = 5 + A.C2;
-
-    _marker_3 = A.C3;
-  }
-}
-
-main() {
-  Main.main();
-}