Move preference MACs to the protected preference stores.

chrome/browser/prefs/dictionary_pref_store.h

Index: chrome/browser/prefs/dictionary_pref_store.h
diff --git a/chrome/browser/prefs/dictionary_pref_store.h b/chrome/browser/prefs/dictionary_pref_store.h
new file mode 100644
index 0000000000000000000000000000000000000000..df950b7ada85a0e8dc05d2932c24e9887cc86015
--- /dev/null
+++ b/chrome/browser/prefs/dictionary_pref_store.h
@@ -0,0 +1,47 @@
+// Copyright 2014 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_DICTIONARY_PREF_STORE_H_
+#define CHROME_BROWSER_PREFS_DICTIONARY_PREF_STORE_H_
+
+#include <string>
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "base/observer_list.h"
+#include "base/prefs/writeable_pref_store.h"
+
+namespace base {
+class DictionaryValue;
+}  // namespace base
+
+// An in-memory PrefStore backed by a DictionaryValue.
+class DictionaryPrefStore : public WriteablePrefStore {
+ public:
+  explicit DictionaryPrefStore(base::DictionaryValue* dictionary);
+
+  // PrefStore implementation
+  virtual bool GetValue(const std::string& key,
+                        const base::Value** result) const OVERRIDE;
+  virtual void AddObserver(PrefStore::Observer* observer) OVERRIDE;
+  virtual void RemoveObserver(PrefStore::Observer* observer) OVERRIDE;
+  virtual bool HasObservers() const OVERRIDE;
+
+  // WriteablePrefStore implementation
+  virtual void SetValue(const std::string& key, base::Value* value) OVERRIDE;
+  virtual void RemoveValue(const std::string& key) OVERRIDE;
+  virtual bool GetMutableValue(const std::string& key,
+                               base::Value** result) OVERRIDE;
+  virtual void ReportValueChanged(const std::string& key) OVERRIDE;
+
+ private:
+  virtual ~DictionaryPrefStore();
+
+  base::DictionaryValue* dictionary_;
+  ObserverList<PrefStore::Observer, true> observers_;
+
+  DISALLOW_COPY_AND_ASSIGN(DictionaryPrefStore);
+};
+
+#endif  // CHROME_BROWSER_PREFS_DICTIONARY_PREF_STORE_H_