Implement new invalidations ack tracking system

sync/notifier/fake_invalidator.h

 // Copyright (c) 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 SYNC_NOTIFIER_FAKE_INVALIDATOR_H_
 #define SYNC_NOTIFIER_FAKE_INVALIDATOR_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "sync/notifier/invalidation_util.h"
 #include "sync/notifier/invalidator.h"
 #include "sync/notifier/invalidator_registrar.h"
 
 namespace syncer {
 
 class FakeInvalidator : public Invalidator {
  public:
   FakeInvalidator();
   virtual ~FakeInvalidator();
 
   bool IsHandlerRegistered(InvalidationHandler* handler) const;
   ObjectIdSet GetRegisteredIds(InvalidationHandler* handler) const;
   const std::string& GetUniqueId() const;
   const std::string& GetCredentialsEmail() const;
   const std::string& GetCredentialsToken() const;
-  const ObjectIdInvalidationMap& GetLastSentInvalidationMap() const;
 
   void EmitOnInvalidatorStateChange(InvalidatorState state);
   void EmitOnIncomingInvalidation(
       const ObjectIdInvalidationMap& invalidation_map);
 
   virtual void RegisterHandler(InvalidationHandler* handler) OVERRIDE;
   virtual void UpdateRegisteredIds(InvalidationHandler* handler,
                                    const ObjectIdSet& ids) OVERRIDE;
   virtual void UnregisterHandler(InvalidationHandler* handler) OVERRIDE;
-  virtual void Acknowledge(const invalidation::ObjectId& id,
-                           const AckHandle& ack_handle) OVERRIDE;
   virtual InvalidatorState GetInvalidatorState() const OVERRIDE;
   virtual void UpdateCredentials(
       const std::string& email, const std::string& token) OVERRIDE;
 
  private:
   InvalidatorRegistrar registrar_;
   std::string state_;
   std::string email_;
   std::string token_;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_NOTIFIER_FAKE_INVALIDATOR_H_