Cull autofill entries older than 60 days.

chrome/browser/webdata/web_data_service.h

Index: chrome/browser/webdata/web_data_service.h
diff --git a/chrome/browser/webdata/web_data_service.h b/chrome/browser/webdata/web_data_service.h
index 9f0ac30d07ee6de7406737730ad4e55043f19f36..54f22fb4bdbac138b62fb8215b45c1560ad42f32 100644
--- a/chrome/browser/webdata/web_data_service.h
+++ b/chrome/browser/webdata/web_data_service.h
@@ -512,6 +512,7 @@ class WebDataService
   // Removes form elements recorded for Autocomplete from the database.
   void RemoveFormElementsAddedBetween(const base::Time& delete_begin,
                                       const base::Time& delete_end);
+  void RemoveExpiredFormElements();
   void RemoveFormValueForElementName(const string16& name,
                                      const string16& value);
 
@@ -715,6 +716,7 @@ class WebDataService
       const string16& name, const string16& prefix, int limit);
   void RemoveFormElementsAddedBetweenImpl(
       GenericRequest2<base::Time, base::Time>* request);
+  void RemoveExpiredFormElementsImpl(WebDataRequest* request);
   void RemoveFormValueForElementNameImpl(
       GenericRequest2<string16, string16>* request);
   void AddAutofillProfileImpl(GenericRequest<AutofillProfile>* request);