Remove unused ProjectConfigDeleteHandler

Change-Id: I3dcae47b45ba7daec1cadbdb8227a07f62902586

src/main/java/com/googlesource/gerrit/plugins/deleteproject/projectconfig/ProjectConfigDeleteHandler.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/deleteproject/projectconfig/ProjectConfigDeleteHandler.java b/src/main/java/com/googlesource/gerrit/plugins/deleteproject/projectconfig/ProjectConfigDeleteHandler.java
deleted file mode 100644
index 9906c6c..0000000
--- a/src/main/java/com/googlesource/gerrit/plugins/deleteproject/projectconfig/ProjectConfigDeleteHandler.java
+++ /dev/null
@@ -1,59 +0,0 @@
-// Copyright (C) 2014 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.googlesource.gerrit.plugins.deleteproject.projectconfig;
-
-import static java.util.stream.Collectors.joining;
-
-import com.google.gerrit.extensions.common.ProjectInfo;
-import com.google.gerrit.server.permissions.PermissionBackendException;
-import com.google.gerrit.server.project.ListChildProjects;
-import com.google.gerrit.server.project.ProjectResource;
-import com.google.inject.Inject;
-import com.google.inject.Provider;
-import com.googlesource.gerrit.plugins.deleteproject.CannotDeleteProjectException;
-import com.googlesource.gerrit.plugins.deleteproject.ProtectedProjects;
-import java.util.List;
-
-public class ProjectConfigDeleteHandler {
-
-  private final ProtectedProjects protectedProjects;
-  private final Provider<ListChildProjects> listChildProjectsProvider;
-
-  @Inject
-  public ProjectConfigDeleteHandler(
-      ProtectedProjects protectedProjects, Provider<ListChildProjects> listChildProjectsProvider) {
-    this.protectedProjects = protectedProjects;
-    this.listChildProjectsProvider = listChildProjectsProvider;
-  }
-
-  public void assertCanDelete(ProjectResource rsrc) throws CannotDeleteProjectException {
-    protectedProjects.assertIsNotProtected(rsrc);
-    assertHasNoChildProjects(rsrc);
-  }
-
-  private void assertHasNoChildProjects(ProjectResource rsrc) throws CannotDeleteProjectException {
-    try {
-      List<ProjectInfo> children = listChildProjectsProvider.get().apply(rsrc);
-      if (!children.isEmpty()) {
-        throw new CannotDeleteProjectException(
-            "Cannot delete project because it has children: "
-                + children.stream().map(info -> info.name).collect(joining(",")));
-      }
-    } catch (PermissionBackendException e) {
-      throw new CannotDeleteProjectException(
-          "Cannot delete project because of failure in permission backend.");
-    }
-  }
-}