Remove unused UpdateParentFailedException

Change-Id: I1aae574a9262411e47a1cd37ed51c2c5bcdd3702

java/com/google/gerrit/common/errors/UpdateParentFailedException.java

@@ -1,26 +0,0 @@
-// Copyright (C) 2013 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package com.google.gerrit.common.errors;
-
-/** Error indicating that updating a parent project failed. */
-public class UpdateParentFailedException extends Exception {
-  private static final long serialVersionUID = 1L;
-
-  public static final String MESSAGE = "Update Parent Project Failed: ";
-
-  public UpdateParentFailedException(String message, Throwable why) {
-    super(MESSAGE + ": " + message, why);
-  }
-}