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

content/browser/indexed_db/leveldb/leveldb_iterator.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_ITERATOR_H_
 #define CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_ITERATOR_H_
 
-#include "content/browser/indexed_db/leveldb/leveldb_slice.h"
+#include "base/strings/string_piece.h"
 
 namespace content {
 
 class LevelDBIterator {
  public:
   virtual ~LevelDBIterator() {}
   virtual bool IsValid() const = 0;
   virtual void SeekToLast() = 0;
-  virtual void Seek(const LevelDBSlice& target) = 0;
+  virtual void Seek(const base::StringPiece& target) = 0;
   virtual void Next() = 0;
   virtual void Prev() = 0;
-  virtual LevelDBSlice Key() const = 0;
-  virtual LevelDBSlice Value() const = 0;
+  virtual base::StringPiece Key() const = 0;
+  virtual base::StringPiece Value() const = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_ITERATOR_H_