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

chrome/browser/prefs/pref_service.cc

 // 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.
 
 #include "chrome/browser/prefs/pref_service.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 818 matching lines @@
   if (pref->GetType() != new_value->GetType()) {
     NOTREACHED() << "Trying to set pref " << path
                  << " of type " << pref->GetType()
                  << " to value of type " << new_value->GetType();
     return;
   }
 
   user_pref_store_->SetValue(path, owned_value.release());
 }
 
-SyncableService* PrefService::GetSyncableService() {
+PrefModelAssociator* PrefService::GetSyncableService() {
   return pref_sync_associator_.get();
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // PrefService::Preference
 
 PrefService::Preference::Preference(const PrefService* service,
                                     const char* name,
                                     base::Value::Type type)
       : name_(name),
@@ skipping 46 matching lines @@
   return pref_value_store()->PrefValueFromDefaultStore(name_.c_str());
 }
 
 bool PrefService::Preference::IsUserModifiable() const {
   return pref_value_store()->PrefValueUserModifiable(name_.c_str());
 }
 
 bool PrefService::Preference::IsExtensionModifiable() const {
   return pref_value_store()->PrefValueExtensionModifiable(name_.c_str());
 }