Implement new invalidations ack tracking system

sync/notifier/unacked_invalidation_set.cc

 // 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.
 
 #include "sync/notifier/unacked_invalidation_set.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "sync/internal_api/public/base/ack_handle.h"
 #include "sync/notifier/object_id_invalidation_map.h"
 #include "sync/notifier/sync_invalidation_listener.h"
@@ skipping 38 matching lines @@
     Truncate(kMaxBufferedInvalidations);
 }
 
 void UnackedInvalidationSet::ExportInvalidations(
     WeakHandle<AckHandler> ack_handler,
     ObjectIdInvalidationMap* out) const {
   for (SingleObjectInvalidationSet::const_iterator it = invalidations_.begin();
        it != invalidations_.end(); ++it) {
     // Copy the invalidation and set the copy's ack_handler.
     Invalidation inv(*it);
-    inv.set_ack_handler(ack_handler);
+    inv.InitAckHandler(ack_handler);
     out->Insert(inv);
   }
 }
 
 void UnackedInvalidationSet::Clear() {
   invalidations_.clear();
 }
 
 void UnackedInvalidationSet::SetHandlerIsRegistered() {
   registered_ = true;
@@ skipping 125 matching lines @@
   // an UnknownVersion invalidation.  We remove the oldest remaining
   // invalidation to make room for it.
   invalidation::ObjectId id = invalidations_.begin()->object_id();
   invalidations_.erase(*invalidations_.begin());
 
   Invalidation unknown_version = Invalidation::InitUnknownVersion(id);
   invalidations_.insert(unknown_version);
 }
 
 }  // namespace syncer