components: Extract pref_registry component out of user_prefs.

components/pref_registry/pref_registry_syncable.h

 // Copyright (c) 2012 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_PREF_REGISTRY_SYNCABLE_H_
-#define COMPONENTS_USER_PREFS_PREF_REGISTRY_SYNCABLE_H_
+#ifndef COMPONENTS_PREF_REGISTRY_PREF_REGISTRY_SYNCABLE_H_
+#define COMPONENTS_PREF_REGISTRY_PREF_REGISTRY_SYNCABLE_H_
 
 #include <set>
 #include <string>
 
 #include "base/callback.h"
 #include "base/prefs/pref_registry.h"
-#include "components/user_prefs/user_prefs_export.h"
+#include "components/pref_registry/pref_registry_export.h"
 
 namespace base {
 class DictionaryValue;
 class FilePath;
 class ListValue;
 class Value;
 }
 
+// TODO(tfarina): Change this namespace to pref_registry.
 namespace user_prefs {
 
 // A PrefRegistry that forces users to choose whether each registered
 // preference is syncable or not.
 //
 // Classes or components that want to register such preferences should
 // define a static function named RegisterUserPrefs that takes a
 // PrefRegistrySyncable*, and the top-level application using the
 // class or embedding the component should call this function at an
 // appropriate time before the PrefService for these preferences is
 // constructed. See e.g. chrome/browser/prefs/browser_prefs.cc which
 // does this for Chrome.
-class USER_PREFS_EXPORT PrefRegistrySyncable : public PrefRegistry {
+class PREF_REGISTRY_EXPORT PrefRegistrySyncable : public PrefRegistry {
  public:
   // Enum used when registering preferences to determine if it should
   // be synced or not. Syncable priority preferences are preferences that are
   // never encrypted and are synced before other datatypes. Because they're
   // never encrypted, on first sync, they can be synced down before the user
   // is prompted for a passphrase.
   enum PrefSyncStatus {
     UNSYNCABLE_PREF,
     SYNCABLE_PREF,
     SYNCABLE_PRIORITY_PREF,
@@ skipping 77 matching lines @@
   SyncableRegistrationCallback callback_;
 
   // Contains the names of all registered preferences that are syncable.
   PrefToStatus syncable_preferences_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefRegistrySyncable);
 };
 
 }  // namespace user_prefs
 
-#endif  // COMPONENTS_USER_PREFS_PREF_REGISTRY_SYNCABLE_H_
+#endif  // COMPONENTS_PREF_REGISTRY_PREF_REGISTRY_SYNCABLE_H_