[Sync] Move change-related methods out of SyncManager::Observer

chrome/browser/sync/test/null_directory_change_delegate.cc

 // Copyright (c) 2011 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 "chrome/browser/sync/test/null_directory_change_delegate.h"
 
 namespace syncable {
 
 NullDirectoryChangeDelegate::~NullDirectoryChangeDelegate() {}
 
 void NullDirectoryChangeDelegate::HandleCalculateChangesChangeEventFromSyncApi(
-    const EntryKernelMutationMap& mutations,
+    const ImmutableWriteTransactionInfo& write_transaction_info,
     BaseTransaction* trans) {}
 
 void NullDirectoryChangeDelegate::HandleCalculateChangesChangeEventFromSyncer(
-    const EntryKernelMutationMap& mutations,
+    const ImmutableWriteTransactionInfo& write_transaction_info,
     BaseTransaction* trans) {}
 
-ModelTypeBitSet NullDirectoryChangeDelegate::HandleTransactionEndingChangeEvent(
-      BaseTransaction* trans) {
+ModelTypeBitSet
+    NullDirectoryChangeDelegate::HandleTransactionEndingChangeEvent(
+        const ImmutableWriteTransactionInfo& write_transaction_info,
+        BaseTransaction* trans) {
   return ModelTypeBitSet();
 }
 
 void NullDirectoryChangeDelegate::HandleTransactionCompleteChangeEvent(
     const ModelTypeBitSet& models_with_changes) {}
 
 }  // namespace syncable