[Sync] Clean up ModelType code.

components/sync/base/sync_prefs.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_SYNC_BASE_SYNC_PREFS_H_
 #define COMPONENTS_SYNC_BASE_SYNC_PREFS_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 104 matching lines @@
 
   // Use this keystore bootstrap token if we're not using an explicit
   // passphrase.
   std::string GetKeystoreEncryptionBootstrapToken() const;
   void SetKeystoreEncryptionBootstrapToken(const std::string& token);
 
   // Use this for the unique machine tag used for session sync.
   std::string GetSyncSessionsGUID() const;
   void SetSyncSessionsGUID(const std::string& guid);
 
-  // Maps |data_type| to its corresponding preference name.
-  static const char* GetPrefNameForDataType(ModelType data_type);
+  // Maps |type| to its corresponding preference name.
+  static const char* GetPrefNameForDataType(ModelType type);
 
 #if defined(OS_CHROMEOS)
   // Use this spare bootstrap token only when setting up sync for the first
   // time.
   std::string GetSpareBootstrapToken() const;
   void SetSpareBootstrapToken(const std::string& token);
 #endif
 
   // Get/set/clear first sync time of current user. Used to roll back browsing
   // data later when user signs out.
@@ skipping 82 matching lines @@
   // etc.
   using PrefGroupsMap = std::map<ModelType, ModelTypeSet>;
   PrefGroupsMap pref_groups_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncPrefs);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_BASE_SYNC_PREFS_H_