content: Cleanup class/struct forward declarations

content/test/test_background_sync_manager.h

 // Copyright 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 CONTENT_TEST_TEST_BACKGROUND_SYNC_MANAGER_H_
 #define CONTENT_TEST_TEST_BACKGROUND_SYNC_MANAGER_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/callback_forward.h"
 #include "base/memory/ref_counted.h"
 #include "content/browser/background_sync/background_sync_manager.h"
 #include "content/browser/service_worker/service_worker_storage.h"
 
 class GURL;
 
 namespace base {
 class TimeDelta;
 }
 
 namespace content {
 
-class BackgroundSyncNetworkObserver;
 struct BackgroundSyncParameters;
-class BackgroundSyncPowerObserver;
 class ServiceWorkerContextWrapper;
 class ServiceWorkerVersion;
 
 // A BackgroundSyncManager for use in unit tests. This class provides control
 // over internal behavior and state, to allow tests to simulate various
 // scenarios.  Examples include (but are not limited to):
 //  - Delaying and corrupting the backend storage.
 //  - Controlling the firing of service worker onsync events.
 //  - Setting the network state
 class TestBackgroundSyncManager : public BackgroundSyncManager {
@@ skipping 107 matching lines @@
   DispatchSyncCallback dispatch_sync_callback_;
   base::Closure delayed_task_;
   base::TimeDelta delayed_task_delta_;
 
   DISALLOW_COPY_AND_ASSIGN(TestBackgroundSyncManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_TEST_TEST_BACKGROUND_SYNC_MANAGER_H_