Revert of [Sync] Move //components/sync to the syncer namespace. (patchset #5 id:40001 of https://co

components/sync/core/data_batch_impl.h

 // Copyright 2015 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.
 
 #ifndef COMPONENTS_SYNC_CORE_DATA_BATCH_IMPL_H_
 #define COMPONENTS_SYNC_CORE_DATA_BATCH_IMPL_H_
 
 #include <stddef.h>
 
 #include <memory>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/macros.h"
 #include "components/sync/api/data_batch.h"
 #include "components/sync/api/entity_data.h"
 
-namespace syncer {
+namespace syncer_v2 {
 
 // An implementation of DataBatch that's purpose is to transfer ownership of
 // EntityData objects. As soon as this batch recieves the EntityData, it owns
 // them until Next() is invoked, when it gives up ownerhsip. Because a vector
 // is used internally, this impl is unaware when duplcate storage_keys are used,
 // and it is the caller's job to avoid this.
 class DataBatchImpl : public DataBatch {
  public:
   DataBatchImpl();
   ~DataBatchImpl() override;
 
   // Takes ownership of the data tied to a given key used for storage. Put
   // should be called at most once for any given storfage_key. Data will be
   // readable in the same order that they are put into the batch.
   void Put(const std::string& storage_key,
            std::unique_ptr<EntityData> entity_data);
 
   // DataBatch implementation.
   bool HasNext() const override;
   KeyAndData Next() override;
 
  private:
   std::vector<KeyAndData> key_data_pairs_;
   size_t read_index_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(DataBatchImpl);
 };
 
-}  // namespace syncer
+}  // namespace syncer_v2
 
 #endif  // COMPONENTS_SYNC_CORE_DATA_BATCH_IMPL_H_