IndexedDB: Switch key/value handling from vector<char> to std::string

content/browser/indexed_db/leveldb/leveldb_database.h

 // Copyright (c) 2013 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 CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_DATABASE_H_
 #define CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_DATABASE_H_
 
 #include <string>
 #include <vector>
 
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string16.h"
+#include "base/strings/string_piece.h"
 #include "content/common/content_export.h"
 
 namespace leveldb {
 class Comparator;
 class DB;
 class Env;
 class Snapshot;
 }
 
 namespace content {
 
 class LevelDBComparator;
 class LevelDBDatabase;
 class LevelDBIterator;
-class LevelDBSlice;
 class LevelDBWriteBatch;
 
 class LevelDBSnapshot {
  private:
   friend class LevelDBDatabase;
   friend class LevelDBTransaction;
 
   explicit LevelDBSnapshot(LevelDBDatabase* db);
   ~LevelDBSnapshot();
 
   leveldb::DB* db_;
   const leveldb::Snapshot* snapshot_;
 };
 
 class CONTENT_EXPORT LevelDBDatabase {
  public:
   static scoped_ptr<LevelDBDatabase> Open(const base::FilePath& file_name,
                                           const LevelDBComparator* comparator,
                                           bool* is_disk_full = 0);
   static scoped_ptr<LevelDBDatabase> OpenInMemory(
       const LevelDBComparator* comparator);
   static bool Destroy(const base::FilePath& file_name);
   virtual ~LevelDBDatabase();
 
-  bool Put(const LevelDBSlice& key, std::vector<char>* value);
-  bool Remove(const LevelDBSlice& key);
-  virtual bool Get(const LevelDBSlice& key,
+  bool Put(const base::StringPiece& key, std::string* value);
+  bool Remove(const base::StringPiece& key);
+  virtual bool Get(const base::StringPiece& key,
                    std::string* value,
                    bool* found,
                    const LevelDBSnapshot* = 0);
   bool Write(const LevelDBWriteBatch& write_batch);
   scoped_ptr<LevelDBIterator> CreateIterator(const LevelDBSnapshot* = 0);
   const LevelDBComparator* Comparator() const;
 
  protected:
   LevelDBDatabase();
 
  private:
   friend class LevelDBSnapshot;
 
   scoped_ptr<leveldb::Env> env_;
   scoped_ptr<leveldb::Comparator> comparator_adapter_;
   scoped_ptr<leveldb::DB> db_;
   const LevelDBComparator* comparator_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_DATABASE_H_