Separate invalidator and sync client ID (part 2/2)

sync/tools/null_invalidation_state_tracker.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 "sync/tools/null_invalidation_state_tracker.h"
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/location.h"
@@ skipping 38 matching lines @@
 std::string NullInvalidationStateTracker::GetBootstrapData() const {
   return std::string();
 }
 
 void NullInvalidationStateTracker::SetBootstrapData(const std::string& data) {
   std::string base64_data;
   CHECK(base::Base64Encode(data, &base64_data));
   LOG(INFO) << "Setting bootstrap data to: " << base64_data;
 }
 
+void NullInvalidationStateTracker::Clear() {
+  // We have no members to clear.
+}
+
 void NullInvalidationStateTracker::GenerateAckHandles(
     const ObjectIdSet& ids,
     const scoped_refptr<base::TaskRunner>& task_runner,
     base::Callback<void(const AckHandleMap&)> callback) {
   AckHandleMap ack_handles;
   for (ObjectIdSet::const_iterator it = ids.begin(); it != ids.end(); ++it) {
     ack_handles.insert(std::make_pair(*it, AckHandle::InvalidAckHandle()));
   }
   CHECK(task_runner->PostTask(FROM_HERE, base::Bind(callback, ack_handles)));
 }
 
 void NullInvalidationStateTracker::Acknowledge(const invalidation::ObjectId& id,
                                                const AckHandle& ack_handle) {
   LOG(INFO) << "Received ack for " << ObjectIdToString(id);
 }
 
 }  // namespace syncer