[Autofill] Enable heuristic detection of credit card issuer fields.

chrome/browser/autofill/email_field.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/autofill/email_field.h"
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/autofill/autofill_regex_constants.h"
 #include "chrome/browser/autofill/autofill_scanner.h"
 #include "ui/base/l10n/l10n_util.h"
 
 // static
-FormField* EmailField::Parse(AutofillScanner* scanner,
-                             bool parse_new_field_types) {
+FormField* EmailField::Parse(AutofillScanner* scanner) {
   const AutofillField* field;
   if (ParseFieldSpecifics(scanner, UTF8ToUTF16(autofill::kEmailRe),
                           MATCH_DEFAULT | MATCH_EMAIL, &field)) {
     return new EmailField(field);
   }
 
   return NULL;
 }
 
 EmailField::EmailField(const AutofillField* field) : field_(field) {
 }
 
 bool EmailField::ClassifyField(FieldTypeMap* map) const {
   return AddClassification(field_, EMAIL_ADDRESS, map);
 }