Autofill database migration to clean up bogus profiles.

chrome/browser/autofill/autofill_country.h

Index: chrome/browser/autofill/autofill_country.h
diff --git a/chrome/browser/autofill/autofill_country.h b/chrome/browser/autofill/autofill_country.h
index eb56d129404d0974e2498769880d0908cc43299f..a99f68bf6af1bf85302d7610efb0cf5e1090a7f3 100644
--- a/chrome/browser/autofill/autofill_country.h
+++ b/chrome/browser/autofill/autofill_country.h
@@ -30,7 +30,8 @@ class AutofillCountry {
   static const std::string CountryCodeForLocale(const std::string& locale);
 
   // Returns the country code corresponding to |country|, which should be a
-  // country code or country name localized to |locale|.
+  // country code or country name localized to |locale|.  This function can
+  // be expensive so use judiciously.
   static const std::string GetCountryCode(const string16& country,
                                           const std::string& locale);