Componentize //chrome/browser/prefs/tracked.

chrome/browser/prefs/tracked/tracked_atomic_preference.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 CHROME_BROWSER_PREFS_TRACKED_TRACKED_ATOMIC_PREFERENCE_H_
-#define CHROME_BROWSER_PREFS_TRACKED_TRACKED_ATOMIC_PREFERENCE_H_
-
-#include <string>
-
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "chrome/browser/prefs/tracked/pref_hash_filter.h"
-#include "chrome/browser/prefs/tracked/tracked_preference.h"
-#include "chrome/browser/prefs/tracked/tracked_preference_helper.h"
-
-class TrackedPreferenceValidationDelegate;
-
-// A TrackedAtomicPreference is tracked as a whole. A hash is stored for its
-// entire value and it is entirely reset on mismatch. An optional delegate is
-// notified of the status of the preference during enforcement.
-class TrackedAtomicPreference : public TrackedPreference {
- public:
-  TrackedAtomicPreference(const std::string& pref_path,
-                          size_t reporting_id,
-                          size_t reporting_ids_count,
-                          PrefHashFilter::EnforcementLevel enforcement_level,
-                          PrefHashFilter::ValueType value_type,
-                          TrackedPreferenceValidationDelegate* delegate);
-
-  // TrackedPreference implementation.
-  void OnNewValue(const base::Value* value,
-                  PrefHashStoreTransaction* transaction) const override;
-  bool EnforceAndReport(base::DictionaryValue* pref_store_contents,
-                        PrefHashStoreTransaction* transaction) const override;
-
- private:
-  const std::string pref_path_;
-  const TrackedPreferenceHelper helper_;
-  TrackedPreferenceValidationDelegate* delegate_;
-
-  DISALLOW_COPY_AND_ASSIGN(TrackedAtomicPreference);
-};
-
-#endif  // CHROME_BROWSER_PREFS_TRACKED_TRACKED_ATOMIC_PREFERENCE_H_