Move webkit/{browser,common}/dom_storage into content/

webkit/common/dom_storage/dom_storage_map.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 WEBKIT_COMMON_DOM_STORAGE_DOM_STORAGE_MAP_H_
-#define WEBKIT_COMMON_DOM_STORAGE_DOM_STORAGE_MAP_H_
-
-#include <map>
-
-#include "base/memory/ref_counted.h"
-#include "base/strings/nullable_string16.h"
-#include "base/strings/string16.h"
-#include "webkit/common/dom_storage/dom_storage_types.h"
-#include "webkit/common/webkit_storage_common_export.h"
-
-namespace dom_storage {
-
-// A wrapper around a std::map that adds refcounting and
-// tracks the size in bytes of the keys/values, enforcing a quota.
-// See class comments for DomStorageContext for a larger overview.
-class WEBKIT_STORAGE_COMMON_EXPORT DomStorageMap
-    : public base::RefCountedThreadSafe<DomStorageMap> {
- public:
-  explicit DomStorageMap(size_t quota);
-
-  unsigned Length() const;
-  base::NullableString16 Key(unsigned index);
-  base::NullableString16 GetItem(const base::string16& key) const;
-  bool SetItem(const base::string16& key, const base::string16& value,
-               base::NullableString16* old_value);
-  bool RemoveItem(const base::string16& key, base::string16* old_value);
-
-  // Swaps this instances values_ with |map|.
-  // Note: to grandfather in pre-existing files that are overbudget,
-  // this method does not do quota checking.
-  void SwapValues(ValuesMap* map);
-
-  // Writes a copy of the current set of values_ to the |map|.
-  void ExtractValues(ValuesMap* map) const { *map = values_; }
-
-  // Creates a new instance of DomStorageMap containing
-  // a deep copy of values_.
-  DomStorageMap* DeepCopy() const;
-
-  size_t bytes_used() const { return bytes_used_; }
-  size_t quota() const { return quota_; }
-  void set_quota(size_t quota) { quota_ = quota; }
-
- private:
-  friend class base::RefCountedThreadSafe<DomStorageMap>;
-  ~DomStorageMap();
-
-  void ResetKeyIterator();
-
-  ValuesMap values_;
-  ValuesMap::const_iterator key_iterator_;
-  unsigned last_key_index_;
-  size_t bytes_used_;
-  size_t quota_;
-};
-
-}  // namespace dom_storage
-
-#endif  // WEBKIT_COMMON_DOM_STORAGE_DOM_STORAGE_MAP_H_