Create a common base class for all the webdatas

components/autofill/browser/autocomplete_history_manager.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_AUTOFILL_BROWSER_AUTOCOMPLETE_HISTORY_MANAGER_H_
 #define COMPONENTS_AUTOFILL_BROWSER_AUTOCOMPLETE_HISTORY_MANAGER_H_
 
 #include <vector>
 
 #include "base/gtest_prod_util.h"
@@ skipping 49 matching lines @@
   friend class AutofillManagerTest;
 
   // Sends the given |suggestions| for display in the Autofill popup.
   void SendSuggestions(const std::vector<string16>* suggestions);
 
  private:
   // Cancels the currently pending WebDataService query, if there is one.
   void CancelPendingQuery();
 
   content::BrowserContext* browser_context_;
-  scoped_ptr<AutofillWebDataService> autofill_data_;
+  scoped_refptr<AutofillWebDataService> autofill_data_;
 
   BooleanPrefMember autofill_enabled_;
 
   // When the manager makes a request from WebDataServiceBase, the database is
   // queried on another thread, we record the query handle until we get called
   // back.  We also store the autofill results so we can send them together.
   WebDataServiceBase::Handle pending_query_handle_;
   int query_id_;
   std::vector<string16> autofill_values_;
   std::vector<string16> autofill_labels_;
   std::vector<string16> autofill_icons_;
   std::vector<int> autofill_unique_ids_;
 
   // Delegate to perform external processing (display, selection) on
   // our behalf.  Weak.
   AutofillExternalDelegate* external_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(AutocompleteHistoryManager);
 };
 
 #endif  // COMPONENTS_AUTOFILL_BROWSER_AUTOCOMPLETE_HISTORY_MANAGER_H_