Cleanup: Remove unneeded forward declarations in chrome/browser/sync.

chrome/browser/sync/engine/all_status.h

 // Copyright (c) 2011 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.
 //
 // The AllStatus object watches various sync engine components and aggregates
 // the status of all of them into one place.
 
 #ifndef CHROME_BROWSER_SYNC_ENGINE_ALL_STATUS_H_
 #define CHROME_BROWSER_SYNC_ENGINE_ALL_STATUS_H_
 #pragma once
 
 #include <map>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
 #include "chrome/browser/sync/engine/syncer_types.h"
 #include "chrome/browser/sync/internal_api/sync_manager.h"
 #include "chrome/browser/sync/syncable/model_type.h"
 
 namespace browser_sync {
 
 class ScopedStatusLock;
-class ServerConnectionManager;
-class Syncer;
-class SyncerThread;
 struct AuthWatcherEvent;
 struct ServerConnectionEvent;
 
 class AllStatus : public SyncEngineEventListener {
   friend class ScopedStatusLock;
  public:
-
   AllStatus();
   virtual ~AllStatus();
 
   void HandleServerConnectionEvent(const ServerConnectionEvent& event);
 
   void HandleAuthWatcherEvent(const AuthWatcherEvent& event);
 
   virtual void OnSyncEngineEvent(const SyncEngineEvent& event);
 
   sync_api::SyncManager::Status status() const;
@@ skipping 27 matching lines @@
  public:
   explicit ScopedStatusLock(AllStatus* allstatus);
   ~ScopedStatusLock();
  protected:
   AllStatus* allstatus_;
 };
 
 }  // namespace browser_sync
 
 #endif  // CHROME_BROWSER_SYNC_ENGINE_ALL_STATUS_H_