Revert of Integrate registry_hash_store_contents with the rest of tracked prefs.

components/user_prefs/tracked/dictionary_hash_store_contents.h

 // 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 COMPONENTS_USER_PREFS_TRACKED_DICTIONARY_HASH_STORE_CONTENTS_H_
 #define COMPONENTS_USER_PREFS_TRACKED_DICTIONARY_HASH_STORE_CONTENTS_H_
 
 #include "base/macros.h"
 #include "components/user_prefs/tracked/hash_store_contents.h"
 
@@ skipping 13 matching lines @@
 class DictionaryHashStoreContents : public HashStoreContents {
  public:
   // Constructs a DictionaryHashStoreContents that reads from and writes to
   // |storage|.
   explicit DictionaryHashStoreContents(base::DictionaryValue* storage);
 
   // Registers required preferences.
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
   // HashStoreContents implementation
-  bool IsCopyable() const override;
-  std::unique_ptr<HashStoreContents> MakeCopy() const override;
   base::StringPiece GetUMASuffix() const override;
   void Reset() override;
   bool GetMac(const std::string& path, std::string* out_value) override;
   bool GetSplitMacs(const std::string& path,
                     std::map<std::string, std::string>* split_macs) override;
   void SetMac(const std::string& path, const std::string& value) override;
   void SetSplitMac(const std::string& path,
                    const std::string& split_path,
                    const std::string& value) override;
   void ImportEntry(const std::string& path,
                    const base::Value* in_value) override;
   bool RemoveEntry(const std::string& path) override;
   const base::DictionaryValue* GetContents() const override;
   std::string GetSuperMac() const override;
   void SetSuperMac(const std::string& super_mac) override;
 
  private:
   base::DictionaryValue* storage_;
 
   // Helper function to get a mutable version of the macs from |storage_|,
   // creating it if needed and |create_if_null| is true.
   base::DictionaryValue* GetMutableContents(bool create_if_null);
 
   DISALLOW_COPY_AND_ASSIGN(DictionaryHashStoreContents);
 };
 
 #endif  // COMPONENTS_USER_PREFS_TRACKED_DICTIONARY_HASH_STORE_CONTENTS_H_