Remove Assignee Validation from plugin.

Assignee is being removed from gerrit. This example will stop working
once it is removed.

Google-Bug-Id: b/33429040
Release-Notes: skip
Change-Id: Ice5e1dda5a7ce78a6d2cc9c8367d02994ac8b854

src/main/java/com/googlesource/gerrit/plugins/cookbook/AssigneeValidator.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/cookbook/AssigneeValidator.java b/src/main/java/com/googlesource/gerrit/plugins/cookbook/AssigneeValidator.java
deleted file mode 100644
index 3bec9da..0000000
--- a/src/main/java/com/googlesource/gerrit/plugins/cookbook/AssigneeValidator.java
+++ /dev/null
@@ -1,54 +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.cookbook;
-
-import com.google.gerrit.reviewdb.client.Account;
-import com.google.gerrit.reviewdb.client.Change;
-import com.google.gerrit.server.query.QueryParseException;
-import com.google.gerrit.server.query.change.ChangeQueryBuilder;
-import com.google.gerrit.server.query.change.ChangeQueryProcessor;
-import com.google.gerrit.server.validators.AssigneeValidationListener;
-import com.google.gerrit.server.validators.ValidationException;
-import com.google.gwtorm.server.OrmException;
-import com.google.inject.Inject;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-public class AssigneeValidator implements AssigneeValidationListener {
-  private static final Logger log = LoggerFactory.getLogger(AssigneeValidationListener.class);
-
-  private static int MAX_ASSIGNED_CHANGES = 5;
-
-  @Inject ChangeQueryBuilder queryBuilder;
-
-  @Inject ChangeQueryProcessor queryProcessor;
-
-  @Override
-  public void validateAssignee(Change change, Account assignee) throws ValidationException {
-    try {
-      if (queryProcessor
-              .query(queryBuilder.assignee(assignee.getPreferredEmail()))
-              .entities()
-              .size()
-          > MAX_ASSIGNED_CHANGES) {
-        throw new ValidationException(
-            "Cannot assign user to more than " + MAX_ASSIGNED_CHANGES + " changes");
-      }
-    } catch (OrmException | QueryParseException e) {
-      log.error("Failed to validate assignee for change " + change.getId(), e);
-      // Allow assignee.
-    }
-  }
-}

src/main/java/com/googlesource/gerrit/plugins/cookbook/Module.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/cookbook/Module.java b/src/main/java/com/googlesource/gerrit/plugins/cookbook/Module.java
index de0b2c3..e70a4ed 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/cookbook/Module.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/cookbook/Module.java
@@ -42,7 +42,6 @@
 import com.google.gerrit.server.git.validators.UploadValidationListener;
 import com.google.gerrit.server.plugins.ServerPluginProvider;
 import com.google.gerrit.server.query.change.ChangeQueryBuilder.ChangeOperatorFactory;
-import com.google.gerrit.server.validators.AssigneeValidationListener;
 import com.google.gerrit.server.validators.HashtagValidationListener;
 import com.google.inject.AbstractModule;
 import com.googlesource.gerrit.plugins.cookbook.pluginprovider.HelloSshPluginProvider;
@@ -71,7 +70,6 @@
     DynamicSet.bind(binder(), UploadValidationListener.class).to(DenyUploadExample.class);
     DynamicSet.bind(binder(), MergeValidationListener.class).to(MergeUserValidator.class);
     DynamicSet.bind(binder(), HashtagValidationListener.class).to(HashtagValidator.class);
-    DynamicSet.bind(binder(), AssigneeValidationListener.class).to(AssigneeValidator.class);
     DynamicSet.bind(binder(), CommitValidationListener.class).to(CommitValidator.class);
     DynamicSet.bind(binder(), NewProjectCreatedListener.class).to(ProjectCreatedListener.class);
     DynamicSet.bind(binder(), RefOperationValidationListener.class)