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

content/browser/indexed_db/leveldb/leveldb_write_batch.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_WRITE_BATCH_H_
 #define CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_WRITE_BATCH_H_
 
 #include "base/memory/scoped_ptr.h"
+#include "base/strings/string_piece.h"
 
 namespace leveldb {
 class WriteBatch;
 }
 
 namespace content {
 
-class LevelDBSlice;
-
 // Wrapper around leveldb::WriteBatch.
 // This class holds a collection of updates to apply atomically to a database.
 class LevelDBWriteBatch {
  public:
   static scoped_ptr<LevelDBWriteBatch> Create();
   ~LevelDBWriteBatch();
 
-  void Put(const LevelDBSlice& key, const LevelDBSlice& value);
-  void Remove(const LevelDBSlice& key);  // Add remove operation to the batch.
+  void Put(const base::StringPiece& key, const base::StringPiece& value);
+  void Remove(const base::StringPiece& key);  // Add remove operation to the
+                                              // batch.
   void Clear();
 
  private:
   friend class LevelDBDatabase;
   LevelDBWriteBatch();
 
   scoped_ptr<leveldb::WriteBatch> write_batch_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_WRITE_BATCH_H_