[Sync] Replacing NULL with nullptr in code and null in comments for components/sync/

components/sync/driver/fake_generic_change_processor.cc

 // Copyright 2014 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 "components/sync/driver/fake_generic_change_processor.h"
 
 #include <utility>
 
 #include "base/location.h"
 #include "base/memory/weak_ptr.h"
 #include "components/sync/model/syncable_service.h"
 
 namespace syncer {
 
 FakeGenericChangeProcessor::FakeGenericChangeProcessor(ModelType type,
                                                        SyncClient* sync_client)
     : GenericChangeProcessor(type,
-                             NULL,
+                             nullptr,
                              base::WeakPtr<SyncableService>(),
                              base::WeakPtr<SyncMergeResult>(),
-                             NULL,
+                             nullptr,
                              sync_client,
                              nullptr),
       sync_model_has_user_created_nodes_(true),
       sync_model_has_user_created_nodes_success_(true) {}
 
 FakeGenericChangeProcessor::~FakeGenericChangeProcessor() {}
 
 void FakeGenericChangeProcessor::set_sync_model_has_user_created_nodes(
     bool has_nodes) {
   sync_model_has_user_created_nodes_ = has_nodes;
@@ skipping 43 matching lines @@
     ModelType type,
     UserShare* user_share,
     std::unique_ptr<DataTypeErrorHandler> error_handler,
     const base::WeakPtr<SyncableService>& local_service,
     const base::WeakPtr<SyncMergeResult>& merge_result,
     SyncClient* sync_client) {
   return std::move(processor_);
 }
 
 }  // namespace syncer