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

content/browser/indexed_db/leveldb/leveldb_slice.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_SLICE_H_
-#define CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_SLICE_H_
-
-#include <string>
-#include <vector>
-
-#include "base/logging.h"
-#include "base/strings/string_piece.h"
-
-namespace content {
-
-class LevelDBSlice {
- public:
-  LevelDBSlice(const char* begin, const char* end) : begin_(begin), end_(end) {
-    DCHECK_GE(end_, begin_);
-  }
-
-  explicit LevelDBSlice(const std::vector<char>& v)
-      : begin_(v.empty() ? NULL : &*v.begin()), end_(begin_ + v.size()) {
-    DCHECK_GE(end_, begin_);
-  }
-
-  explicit LevelDBSlice(const std::string& v)
-      : begin_(v.data()), end_(v.data() + v.size()) {
-    DCHECK_GE(end_, begin_);
-  }
-
-  ~LevelDBSlice() {}
-
-  const char* begin() const { return begin_; }
-  const char* end() const { return end_; }
-
-  base::StringPiece AsStringPiece() const {
-    return base::StringPiece(begin_, end_ - begin_);
-  }
-
- private:
-  const char* begin_;
-  const char* end_;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_INDEXED_DB_LEVELDB_LEVELDB_SLICE_H_