Removes compile-time error from implementing the same interface more than once

compiler/java/com/google/dart/compiler/resolver/DuplicatedInterfaceException.java

Index: compiler/java/com/google/dart/compiler/resolver/DuplicatedInterfaceException.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/DuplicatedInterfaceException.java b/compiler/java/com/google/dart/compiler/resolver/DuplicatedInterfaceException.java
deleted file mode 100644
index a7ee5b07f75f63a990afd6d158d00302396a0bae..0000000000000000000000000000000000000000
--- a/compiler/java/com/google/dart/compiler/resolver/DuplicatedInterfaceException.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.resolver;
-
-import com.google.dart.compiler.type.InterfaceType;
-
-/**
- * Exception thrown if a duplicated interface is detected in the supertype graph of a class or
- * interface.
- */
-public class DuplicatedInterfaceException extends Exception {
-  private final InterfaceType first;
-  private final InterfaceType second;
-
-  public DuplicatedInterfaceException(InterfaceType first, InterfaceType second) {
-    super(first + " & " + second);
-    this.first = first;
-    this.second = second;
-  }
-
-  public InterfaceType getFirst() {
-    return first;
-  }
-
-  public InterfaceType getSecond() {
-    return second;
-  }
-}