chrome: Cleanup class/struct forward declarations

chrome/browser/safe_browsing/test_safe_browsing_service.h

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_SAFE_BROWSING_TEST_SAFE_BROWSING_SERVICE_H_
 #define CHROME_BROWSER_SAFE_BROWSING_TEST_SAFE_BROWSING_SERVICE_H_
 
 #include "chrome/browser/safe_browsing/safe_browsing_service.h"
 
 #include "chrome/browser/safe_browsing/protocol_manager.h"
 #include "chrome/browser/safe_browsing/protocol_manager_helper.h"
 #include "chrome/browser/safe_browsing/ui_manager.h"
 #include "components/safe_browsing_db/v4_protocol_manager_util.h"
 
 namespace safe_browsing {
 struct SafeBrowsingProtocolConfig;
 class SafeBrowsingDatabaseManager;
-class SafeBrowsingPingManager;
-class SafeBrowsingProtocolManager;
 struct V4ProtocolConfig;
 class TestSafeBrowsingDatabaseManager;
 class TestSafeBrowsingUIManager;
 
 // TestSafeBrowsingService and its factory provides a flexible way to configure
 // customized safe browsing UI manager, database manager, protocol manager,
 // and etc without the need of override SafeBrowsingService in tests over and
 // over again.
 //
 // How to configure TestSafeBrowsingService in browser tests set up?
@@ skipping 92 matching lines @@
  protected:
   ~TestSafeBrowsingUIManager() override;
   std::list<std::string> details_;
 
   DISALLOW_COPY_AND_ASSIGN(TestSafeBrowsingUIManager);
 };
 
 }  // namespace safe_browsing
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_TEST_SAFE_BROWSING_SERVICE_H_