Remove unused class

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=125491862

java/google/registry/request/ServletDelegate.java

@@ -1,51 +0,0 @@
-// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
-//
-// 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 google.registry.request;
-
-import java.io.IOException;
-
-import javax.inject.Inject;
-import javax.servlet.ServletException;
-import javax.servlet.http.HttpServlet;
-import javax.servlet.http.HttpServletRequest;
-import javax.servlet.http.HttpServletResponse;
-
-/**
- * Action that delegates to a servlet.
- *
- * <p>This is a transitory solution for using legacy servlets inside the new injection action
- * framework.
- *
- * @param <T> servlet type, which must have an {@link Inject @Inject} constructor
- */
-public abstract class ServletDelegate<T extends HttpServlet> implements Runnable {
-
-  @Inject T servlet;
-  @Inject HttpServletRequest req;
-  @Inject HttpServletResponse rsp;
-
-  protected ServletDelegate() {}
-
-  @Override
-  public final void run() {
-    try {
-      servlet.init();
-      servlet.service(req, rsp);
-      servlet.destroy();
-    } catch (ServletException | IOException e) {
-      throw new RuntimeException(e);
-    }
-  }
-}