Refactor preference syncing.

chrome/browser/password_manager/password_store_default.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/password_manager/password_store_default.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #include "base/stl_util-inl.h"
@@ skipping 137 matching lines @@
   const PasswordForms& forms =
       static_cast<const WDResult<PasswordForms>*>(result)->GetValue();
   for (PasswordForms::const_iterator it = forms.begin();
        it != forms.end(); ++it) {
     AddLogin(**it);
     web_data_service_->RemoveLogin(**it);
     delete *it;
   }
   if (handles_.empty()) {
     profile_->GetPrefs()->RegisterBooleanPref(prefs::kLoginDatabaseMigrated,
-                                              true);
+                                              true,
+                                              false /* don't sync pref */);
   }
 }