Remove backends.

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

Index: compiler/java/com/google/dart/compiler/backend/js/JsErrorCode.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/JsErrorCode.java b/compiler/java/com/google/dart/compiler/backend/js/JsErrorCode.java
deleted file mode 100644
index abdde376fbc8754473a287c9723f79884fd1ae82..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/js/JsErrorCode.java
+++ /dev/null
@@ -1,49 +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.ErrorCode;
-import com.google.dart.compiler.ErrorSeverity;
-import com.google.dart.compiler.SubSystem;
-
-/**
- * {@link ErrorCode}s for JavaScript backend.
- */
-public enum JsErrorCode implements ErrorCode {
-  INTERNAL_ERROR("internal error: %s");
-  private final ErrorSeverity severity;
-  private final String message;
-
-  /**
-   * Initialize a newly created error code to have the given message and ERROR severity.
-   */
-  private JsErrorCode(String message) {
-    this(ErrorSeverity.ERROR, message);
-  }
-
-  /**
-   * Initialize a newly created error code to have the given severity and message.
-   */
-  private JsErrorCode(ErrorSeverity severity, String message) {
-    this.severity = severity;
-    this.message = message;
-  }
-
-  public String getMessage() {
-    return message;
-  }
-
-  public ErrorSeverity getErrorSeverity() {
-    return severity;
-  }
-
-  public SubSystem getSubSystem() {
-    return SubSystem.JS_BACKEND;
-  }
-
-  @Override
-  public boolean needsRecompilation() {
-    return true;
-  }
-}