components: Cleanup class/struct fwd declarations

components/sync/engine/sync_manager.h

 // Copyright 2012 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 COMPONENTS_SYNC_ENGINE_SYNC_MANAGER_H_
 #define COMPONENTS_SYNC_ENGINE_SYNC_MANAGER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 23 matching lines @@
 #include "google_apis/gaia/oauth2_token_service.h"
 
 class GURL;
 
 namespace base {
 namespace trace_event {
 class ProcessMemoryDump;
 }  // namespace trace_event
 }  // namespace base
 
-namespace sync_pb {
-class EncryptedData;
-}  // namespace sync_pb
-
 namespace syncer {
 
 class BaseTransaction;
 class CancelationSignal;
 class DataTypeDebugInfoListener;
 class Encryptor;
 class EngineComponentsFactory;
 class ExtensionsActivity;
 class JsBackend;
 class JsEventHandler;
 class ProtocolEvent;
 class SyncCycleSnapshot;
 class SyncEncryptionHandler;
-class SyncScheduler;
 class TypeDebugInfoObserver;
 class UnrecoverableErrorHandler;
 struct Experiments;
 struct UserShare;
 
 // Contains everything needed to talk to and identify a user account.
 struct SyncCredentials {
   SyncCredentials();
   SyncCredentials(const SyncCredentials& other);
   ~SyncCredentials();
@@ skipping 335 matching lines @@
   // Note: this does not trigger a sync cycle. It just updates the sync context.
   virtual void OnCookieJarChanged(bool account_mismatch, bool empty_jar) = 0;
 
   // Adds memory usage statistics to |pmd| for chrome://tracing.
   virtual void OnMemoryDump(base::trace_event::ProcessMemoryDump* pmd) = 0;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_SYNC_MANAGER_H_