[Sync] Move model_type* from syncable/ to base/

sync/notifier/sync_notifier.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.
 //
 // Interface to the sync notifier, which is an object that receives
 // notifications when updates are available for a set of sync types.
 // All the observers are notified when such an event happens.
 
 #ifndef SYNC_NOTIFIER_SYNC_NOTIFIER_H_
 #define SYNC_NOTIFIER_SYNC_NOTIFIER_H_
 
 #include <string>
 
-#include "sync/internal_api/public/syncable/model_type.h"
+#include "sync/internal_api/public/base/model_type.h"
 
 namespace syncer {
 class SyncNotifierObserver;
 
 class SyncNotifier {
  public:
   SyncNotifier() {}
   virtual ~SyncNotifier() {}
 
   virtual void AddObserver(SyncNotifierObserver* observer) = 0;
@@ skipping 21 matching lines @@
   // This is here only to support the old p2p notification implementation,
   // which is still used by sync integration tests.
   // TODO(akalin): Remove this once we move the integration tests off p2p
   // notifications.
   virtual void SendNotification(
       syncable::ModelTypeSet changed_types) = 0;
 };
 }  // namespace syncer
 
 #endif  // SYNC_NOTIFIER_SYNC_NOTIFIER_H_