[Sync] Refactor non-frontend DTC to handle new API properly.

chrome/browser/prefs/pref_model_associator.h

 // Copyright (c) 2011 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_PREF_MODEL_ASSOCIATOR_H_
 #define CHROME_BROWSER_PREFS_PREF_MODEL_ASSOCIATOR_H_
 #pragma once
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
+#include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/sync/api/syncable_service.h"
 #include "chrome/browser/sync/api/sync_data.h"
 
 namespace sync_pb {
 class PreferenceSpecifics;
 }
 
 namespace base {
 class Value;
 }
 
 // Contains all preference sync related logic.
 // TODO(sync): Merge this into PrefService once we separate the profile
 // PrefService from the local state PrefService.
 class PrefModelAssociator
     : public SyncableService,
+      public base::SupportsWeakPtr<PrefModelAssociator>,
       public base::NonThreadSafe {
  public:
   explicit PrefModelAssociator(PrefService* pref_service);
   virtual ~PrefModelAssociator();
 
   // SyncableService implementation.
   virtual SyncDataList GetAllSyncData(syncable::ModelType type) const OVERRIDE;
   virtual SyncError ProcessSyncChanges(
       const tracked_objects::Location& from_here,
       const SyncChangeList& change_list) OVERRIDE;
@@ skipping 94 matching lines @@
   // The PrefService we are syncing to.
   PrefService* pref_service_;
 
   // Sync's SyncChange handler. We push all our changes through this.
   SyncChangeProcessor* sync_processor_;
 
   DISALLOW_COPY_AND_ASSIGN(PrefModelAssociator);
 };
 
 #endif  // CHROME_BROWSER_PREFS_PREF_MODEL_ASSOCIATOR_H_