[Sync] Move snapshot cache from SBHI to PSS.

components/sync/engine/fake_sync_engine.h

 // Copyright 2013 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_FAKE_SYNC_ENGINE_H_
 #define COMPONENTS_SYNC_ENGINE_FAKE_SYNC_ENGINE_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 42 matching lines @@
   void DeactivateDirectoryDataType(ModelType type) override;
 
   void ActivateNonBlockingDataType(ModelType type,
                                    std::unique_ptr<ActivationContext>) override;
   void DeactivateNonBlockingDataType(ModelType type) override;
 
   UserShare* GetUserShare() const override;
 
   Status GetDetailedStatus() override;
 
-  SyncCycleSnapshot GetLastCycleSnapshot() const override;
-
   bool HasUnsyncedItems() const override;
 
   bool IsNigoriEnabled() const override;
 
   PassphraseType GetPassphraseType() const override;
 
   base::Time GetExplicitPassphraseTime() const override;
 
   bool IsCryptographerReady(const BaseTransaction* trans) const override;
 
@@ skipping 16 matching lines @@
 
   void set_fail_initial_download(bool should_fail);
 
  private:
   bool fail_initial_download_;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_FAKE_SYNC_ENGINE_H_