Revert 133815 - GDataDB support with leveldb.

chrome/browser/chromeos/gdata/gdata_db.h

-// 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.
-
-#ifndef CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DB_H_
-#define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DB_H_
-#pragma once
-
-#include <string>
-
-#include "base/memory/scoped_ptr.h"
-
-class FilePath;
-
-namespace gdata {
-
-class GDataEntry;
-class GDataDBIter;
-
-// GData Database interface class.
-class GDataDB {
- public:
-  enum Status {
-    DB_OK = 0,
-    DB_KEY_NOT_FOUND,  // Key not found.
-    DB_CORRUPTION,  // Database file corrupt.
-    DB_IO_ERROR,  // File I/O error.
-    DB_INTERNAL_ERROR,
-  };
-
-  virtual ~GDataDB() {}
-
-  // Puts |entry| to the database.
-  virtual Status Put(const GDataEntry& entry) = 0;
-
-  // Deletes a database entry with key |resource_id| or |path| respectively.
-  virtual Status DeleteByResourceId(const std::string& resource_id) = 0;
-  virtual Status DeleteByPath(const FilePath& path) = 0;
-
-  // Fetches a GDataEntry* by key |resource_id| or |path| respectively.
-  virtual Status GetByResourceId(const std::string& resource_id,
-                                 scoped_ptr<GDataEntry>* entry) = 0;
-  virtual Status GetByPath(const FilePath& path,
-                           scoped_ptr<GDataEntry>* entry) = 0;
-
-  // Creates an iterator to fetch all GDataEntry's under |path|.
-  // Will not return NULL.
-  virtual scoped_ptr<GDataDBIter> CreateIterator(const FilePath& path) = 0;
-
- protected:
-  GDataDB() {}
-};
-
-// GData Database Iterator interface class.
-class GDataDBIter {
- public:
-  virtual ~GDataDBIter() {}
-
-  // Fetches the next |entry| in the iteration sequence. Returns false when
-  // there are no more entries.
-  virtual bool GetNext(std::string* path, scoped_ptr<GDataEntry>* entry) = 0;
-
- protected:
-  GDataDBIter() {}
-};
-
-}  // namespace gdata
-
-#endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DB_H_