Create a common base class for all the webdatas

chrome/browser/api/webdata/autofill_web_data_service.h

Index: chrome/browser/api/webdata/autofill_web_data_service.h
diff --git a/chrome/browser/api/webdata/autofill_web_data_service.h b/chrome/browser/api/webdata/autofill_web_data_service.h
index ee39ad72d3fd63234983ec00ba6fafa7cbcbe5db..334daf21a58289f175968915d3df2d8b1e602718 100644
--- a/chrome/browser/api/webdata/autofill_web_data_service.h
+++ b/chrome/browser/api/webdata/autofill_web_data_service.h
@@ -19,9 +19,10 @@ class AutofillWebDataService
   // Retrieve an AutofillWebDataService for the given context.
   //
   // Can return NULL in some contexts.
-  static scoped_ptr<AutofillWebDataService> FromBrowserContext(
+  static scoped_refptr<AutofillWebDataService> FromBrowserContext(
       content::BrowserContext* context);
 
+ protected:
   virtual ~AutofillWebDataService() {}
 };