[Sync] Remove SyncEngine::UnregisterInvalidationIds

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 25 matching lines @@
 
   void SetEncryptionPassphrase(const std::string& passphrase,
                                bool is_explicit) override;
 
   bool SetDecryptionPassphrase(const std::string& passphrase) override;
 
   void StopSyncingForShutdown() override;
 
   void Shutdown(ShutdownReason reason) override;
 
-  void UnregisterInvalidationIds() override;
-
   ModelTypeSet ConfigureDataTypes(
       ConfigureReason reason,
       const DataTypeConfigStateMap& config_state_map,
       const base::Callback<void(ModelTypeSet, ModelTypeSet)>& ready_task,
       const base::Callback<void()>& retry_callback) override;
 
   void EnableEncryptEverything() override;
 
   void ActivateDirectoryDataType(ModelType type,
                                  ModelSafeGroup group,
@@ skipping 39 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_