Sanitize PrefStore interface.

chrome/browser/prefs/default_pref_store.h

+// Copyright (c) 2010 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 CHROME_BROWSER_PREFS_DEFAULT_PREF_STORE_H_
+#define CHROME_BROWSER_PREFS_DEFAULT_PREF_STORE_H_
+#pragma once
+
+#include <map>
+
+#include "base/basictypes.h"
+#include "chrome/browser/prefs/value_map_pref_store.h"
+
+// This PrefStore keeps track of default preference values set when a
+// preference is registered with the PrefService.
+class DefaultPrefStore : public ValueMapPrefStore {
+ public:
+  DefaultPrefStore() {}
+  virtual ~DefaultPrefStore() {}
+
+  // Stores a new |value| for |key|. Assumes ownership of |value|.
+  void SetDefaultValue(const std::string& key, Value* value) {
+    SetValue(key, value);
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DefaultPrefStore);
+};
+
+#endif  // CHROME_BROWSER_PREFS_DEFAULT_PREF_STORE_H_