Implement new invalidations ack tracking system

sync/notifier/invalidator_registrar_unittest.cc

 // 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.
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "google/cacheinvalidation/types.pb.h"
 #include "sync/notifier/fake_invalidation_handler.h"
 #include "sync/notifier/invalidator_registrar.h"
@@ skipping 24 matching lines @@
 
   virtual void UpdateRegisteredIds(InvalidationHandler* handler,
                                    const ObjectIdSet& ids) OVERRIDE {
     registrar_.UpdateRegisteredIds(handler, ids);
   }
 
   virtual void UnregisterHandler(InvalidationHandler* handler) OVERRIDE {
     registrar_.UnregisterHandler(handler);
   }
 
-  virtual void Acknowledge(const invalidation::ObjectId& id,
-                           const AckHandle& ack_handle) OVERRIDE {
-    // Do nothing.
-  }
-
   virtual InvalidatorState GetInvalidatorState() const OVERRIDE {
     return registrar_.GetInvalidatorState();
   }
 
   virtual void UpdateCredentials(
       const std::string& email, const std::string& token) OVERRIDE {
     // Do nothing.
   }
 
  private:
@@ skipping 94 matching lines @@
   EXPECT_DEATH({ registrar.UpdateRegisteredIds(&handler2, ids); }, "");
 
   registrar.UnregisterHandler(&handler2);
   registrar.UnregisterHandler(&handler1);
 }
 #endif  // GTEST_HAS_DEATH_TEST
 
 }  // namespace
 
 }  // namespace syncer