Remove backends.

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

Index: compiler/java/com/google/dart/compiler/backend/js/UncheckedJsParserException.java
diff --git a/compiler/java/com/google/dart/compiler/backend/js/UncheckedJsParserException.java b/compiler/java/com/google/dart/compiler/backend/js/UncheckedJsParserException.java
deleted file mode 100644
index c2db8120537b38b7748d7faa9ca9c90f83dcd9a7..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/backend/js/UncheckedJsParserException.java
+++ /dev/null
@@ -1,21 +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;
-
-/**
- *  An unchecked wrapper exception to interop with Rhino.
- */
-class UncheckedJsParserException extends RuntimeException {
-
-  private final JsParserException parserException;
-
-  public UncheckedJsParserException(JsParserException parserException) {
-    this.parserException = parserException;
-  }
-
-  public JsParserException getParserException() {
-    return parserException;
-  }
-}