Revert of Move base/prefs to components/prefs

base/prefs/value_map_pref_store.h

Index: base/prefs/value_map_pref_store.h
diff --git a/base/prefs/value_map_pref_store.h b/base/prefs/value_map_pref_store.h
index 4373ff72716db5781223d84aa2151a6397c7cfa3..eac785d4e2551d9a19b4edccaf6098c0c24c4c38 100644
--- a/base/prefs/value_map_pref_store.h
+++ b/base/prefs/value_map_pref_store.h
@@ -2,6 +2,56 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// TODO(brettw) remove this forwarding header when prefs is completely moved to
-// components.
-#include "components/prefs/value_map_pref_store.h"
+#ifndef BASE_PREFS_VALUE_MAP_PREF_STORE_H_
+#define BASE_PREFS_VALUE_MAP_PREF_STORE_H_
+
+#include <stdint.h>
+
+#include <map>
+#include <string>
+
+#include "base/macros.h"
+#include "base/observer_list.h"
+#include "base/prefs/base_prefs_export.h"
+#include "base/prefs/pref_value_map.h"
+#include "base/prefs/writeable_pref_store.h"
+
+// A basic PrefStore implementation that uses a simple name-value map for
+// storing the preference values.
+class BASE_PREFS_EXPORT ValueMapPrefStore : public WriteablePrefStore {
+ public:
+  ValueMapPrefStore();
+
+  // PrefStore overrides:
+  bool GetValue(const std::string& key,
+                const base::Value** value) const override;
+  void AddObserver(PrefStore::Observer* observer) override;
+  void RemoveObserver(PrefStore::Observer* observer) override;
+  bool HasObservers() const override;
+
+  // WriteablePrefStore overrides:
+  void SetValue(const std::string& key,
+                scoped_ptr<base::Value> value,
+                uint32_t flags) override;
+  void RemoveValue(const std::string& key, uint32_t flags) override;
+  bool GetMutableValue(const std::string& key, base::Value** value) override;
+  void ReportValueChanged(const std::string& key, uint32_t flags) override;
+  void SetValueSilently(const std::string& key,
+                        scoped_ptr<base::Value> value,
+                        uint32_t flags) override;
+
+ protected:
+  ~ValueMapPrefStore() override;
+
+  // Notify observers about the initialization completed event.
+  void NotifyInitializationCompleted();
+
+ private:
+  PrefValueMap prefs_;
+
+  base::ObserverList<PrefStore::Observer, true> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(ValueMapPrefStore);
+};
+
+#endif  // BASE_PREFS_VALUE_MAP_PREF_STORE_H_